Sorry, I must be stupid, TAP TubeWarmth IS also WORKING ! I changed the settings fully and, on my tiny 2" speaker, the sound is much warmer ! Still Harmonic generator is not working the way I would too (that is, without using the equal control. Does anybody knows wheither it can be changed from within the asound.conf ? And how ? Best Regards, Jean 2016-09-03 11:38 GMT+02:00 Jean Beauve <jean.beauve(a)gmail.com>om>: -- Cordialement, Jean -- View this message in context: http://linux-audio.4202.n7.nabble.com/LADSPA-Plugins-from-ALSA-would-like-s… Sent from the linux-audio-user mailing list archive at Nabble.com.

Hello, I believe that my problem is a format problem but I really don't find the way to solve it ! Here is my latest implementation : *INPUT -> OUTPUT:* /pcm.!default { # *INPUT* # type plug type route slave.pcm conversion_plug; # slave.pcm BassMax; # slave.pcm mix; # slave.pcm "plughw:0,0" slave.channels 2 #To get MONO out from Left Channel) ttable.0.0 0.5 ttable.1.0 0.5 ttable.0.1 0.5 ttable.1.1 0.5 } pcm.conversion_plug { # *CONVERSION PLUG* type plug # slave.pcm mix slave.pcm BassMax } pcm.BassMax { # *BASSMAX* type ladspa slave.pcm mix; path "/usr/lib/ladspa" channels 2 plugins { 0 { id 1098 # Identity (Audio) (1098/identity_audio) policy duplicate # Keep Left Channel unchanged input.bindings.0 "Input"; output.bindings.0 "Output"; } 1 { id 1672 # 4 Pole Low-Pass Filter with Resonance (FCRCIA) (1672/lp4p$ policy none # Apply Low Pass Filter to subwoofer mon$ input.bindings.0 "Input"; output.bindings.0 "Output"; input { controls [ 200 2 ] } } 2 { id 1220 # Overtone (Harmonics Generator) policy none # Apply Overtone to subwoofer mono Mix input.bindings.0 "Input"; output.bindings.0 "Output"; input { controls [ 1 -1 0 1 0.2 -1 -1 1 -1 -1 ] } } } } pcm.mix { # *OUPUT* # type plug type route slave.pcm "plughw:0,0" slave.channels 2 ttable { 0.0 0.5 # left channel = mono mix left and right$ 1.0 0.5 } }/ And here are the trials I made to get SOUND : *1/ INPUT -> OUTPUT:* #1 INPUT (type plug) -> OUPUT (type plug), I get an error: squeezelite: pcm_params.c:170: snd1_pcm_hw_param_get_min: Assertion `!snd_interval_empty(i)' failed. #2 INPUT (type plug) -> OUPUT (type route), I get sound #3 INPUT (type route) -> OUPUT (type plug), I get sound #4 INPUT (type route) -> OUTPUT (type route), I get sound *WHY ?* Anyway, I thought that different format type between INPUT and OUTPUT was THE solution, so I tried : *2/ INPUT -> BASSMAX -> OUTPUT :* #1 INPUT (type plug) -> BASSMAX -> OUPUT (type plug): squeezelite: pcm_params.c:170: snd1_pcm_hw_param_get_min: Assertion `!snd_interval_empty(i)' failed. #2 INPUT (type plug) -> BASSMAX -> OUPUT (route plug):, #3 INPUT (type route) -> BASSMAX -> OUPUT (route plug), #4 INPUT (type route) -> BASSMAX -> OUPUT (type plug), Produced the same error : [10:18:13.284316] test_open:130 hwparam init error: Invalid argument [10:18:13.286370] output_init_common:373 unable to open output device So,I tried to convert the type from route to plug: *3/ INPUT -> CONVERSION PLUG -> BASSMAX -> OUTPUT :* #1: INPUT (type route) -> CONVERSION PLUG (type plug) -> BASSMAX -> OUPUT (type plug): squeezelite: pcm_params.c:170: snd1_pcm_hw_param_get_min: Assertion `!snd_interval_empty(i)' failed. Aborted #2: INPUT (type route) -> CONVERSION PLUG (type plug) -> BASSMAX -> OUPUT (type route): [12:00:38.138447] test_open:130 hwparam init error: Invalid argument [12:00:38.140665] output_init_common:373 unable to open output device *This one should have worked !* Then I thought I should try again *without* the BASSMAX just to confirm it was working *4/ INPUT -> CONVERSION PLUG -> OUTPUT :* #1 INPUT (type route) -> CONVERSION PLUG (type plug) -> OUPUT (type route), YES, I got sound #2 INPUT (type plug) -> CONVERSION PLUG (type route) -> OUPUT (type plug), failed: [12:51:11.783791] test_open:124 playback open error: Invalid argument [12:51:11.785627] output_init_common:373 unable to open output device #3 atltough without any interest INPUT (type plug) -> CONVERSION PLUG (type plug) -> OUPUT (type route), also failed: squeezelite: pcm_params.c:170: snd1_pcm_hw_param_get_min: Assertion `!snd_interval_empty(i)' failed. Aborted #4 atltough without any interest INPUT (type route) -> CONVERSION PLUG (type route) -> OUPUT (type plug), also failed: [13:16:07.156408] test_open:124 playback open error: Invalid argument [13:16:07.158014] output_init_common:373 unable to open output device *It looks like I have to have the INPUT in type route* However, although I thought that the LADSPA might not like the INPUT in route type, I also tried to add the conversion plug in between BASSMAX and OUTPUT 5/ INPUT -> BASSMAX -> CONVERSION PLUG -> OUPUT # 1 INPUT (plug type) -> BASSMAX -> CONVERSION PLUG (type plug) -> OUPUT (type route), I got : squeezelite: pcm_params.c:170: snd1_pcm_hw_param_get_min: Assertion `!snd_interval_empty(i)' failed. Aborted # 2 INPUT (plug type) -> BASSMAX -> CONVERSION PLUG (type route) -> OUPUT (type plug), I got : [12:21:59.863034] test_open:124 playback open error: Invalid argument [12:21:59.864826] output_init_common:373 unable to open output device #3 INPUT (plug type) -> BASSMAX -> CONVERSION PLUG (type route) -> OUPUT (type route), I got : [12:25:25.686880] test_open:124 playback open error: Invalid argument [12:25:25.688497] output_init_common:373 unable to open output device #4 INPUT (plug type) -> BASSMAX -> CONVERSION PLUG (type plug) -> OUPUT (type plug), I got: squeezelite: pcm_params.c:170: snd1_pcm_hw_param_get_min: Assertion `!snd_interval_empty(i)' failed. Aborted #5 INPUT (type route) -> BASSMAX -> CONVERSION PLUG (type route) -> OUTPUT (type plug) I got: [12:32:08.213364] test_open:124 playback open error: Invalid argument [12:32:08.215192] output_init_common:373 unable to open output device #6 INPUT (type route) -> BASSMAX -> CONVERSION PLUG (type plug) -> OUTPUT (type route) I got: [12:34:21.398664] test_open:130 hwparam init error: Invalid argument [12:34:21.400769] output_init_common:373 unable to open output device *This one might have worked, unless LADSPA doesn’t accept route type as input* NOTE that: INPUT (type route) -> CONVERSION PLUG (type plug) -> BASSMAX -> PLUGHW works I get, from a 63Hz sine wave at the input, 126 Hz on the left Channel and 63Hz not attenuated on the right Channel. *So what are my left options ?* Best regards, Jean -- View this message in context: http://linux-audio.4202.n7.nabble.com/LADSPA-Plugins-from-ALSA-would-like-s… Sent from the linux-audio-user mailing list archive at Nabble.com.

On Wed, 7 Sep 2016 07:22:07 -0700 (MST) bricolodu <jean.beauve(a)gmail.com> wrote: I'm not a plugin user, so can't really offer suggestions. However, I will say I'm rather surprised nobody else has responded. -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

On Wed, September 7, 2016 9:22 am, bricolodu wrote: So do I understand the situation correctly as the hardware is a 2 inch/5cm speaker, and you are trying to give the impression of more bass by adding distortion? I think that trick works best when the speaker system can get down to within one octave of full bass response, so down to below 80Hz for sure, and you have to be careful to not apply enough distortion that everything sounds worse. You may also need something like a speaker crossover, where only frequencies below the bass cutoff of the speaker system are sent to the distortion circuit, then the output of that goes through a high pass to get rid of the low frequencies which cannot be reproduced by the speaker, and the harmonics added back in to the original source to create the illusion. I'm not sure where you are located, does your locale have a saying regarding attempting to make a high quality result when starting from limited quality source materials? Perhaps you are finding the limits of such a small system. http://www.dictionary.com/browse/can-t-make-a-silk-purse-out-of-a-sow-s-ear -- Chris Caudle

Hello, Thank you for the answers, I was feeling a little bit alone ! Well, Chris, Let me try to answer, It is a kind of a challenge to work with a 2" speaker and try to get bass, that is why I tried it. May be you are right I will never succeed. But Bose SoundLink mini is not so bad at this game. It is one of the only Bose mass market product that is musical. My challenge is to have a better system, I don't think I have succeeded yet, although I don't have a Bose Soundlink mini to compare with. Ok, that said, after a little time spent with the settings, I'm just able to have more Boom Boom like a bad sono from the 80's. I could decrease the settings though. I recognised that I hoped for something else... By the way according to the box my 2" speaker is in, without any settings, I can go down to less than 60 Hz ! But then, the size of the box is too big, around 5L and I want 0.5L ! Now,there is something I didn't understand in your point: /you are trying to give the impression of more bass by adding distortion? / YES /I think that trick works best when the speaker system can get down to within one octave of full bass response, so down to below 80Hz for sure, / It is the case with the 5L box, I can even listen to 30 Hz although attenuated ! /and you have to be careful to not apply enough distortion that everything sounds worse./ Right, just boom boom like a sono /You may also need something like a speaker crossover, where only frequencies below the bass cutoff of the speaker system are sent to the distortion circuit,/ This is what I'm doing, a low pass that cuts everything above 200 Hz first. /then the output of that goes through a high pass to get rid of the low frequencies which cannot be reproduced by the speaker, / Why ? To lower distortion ? What cut-off Frequency ? It will be very limited if I use the 0.5L box, the natural cutoff frequency of the box is around 150 Hz. /and the harmonics added back in to the original source to create the illusion. / This is what I'm doing. Fons, /It's not clear what the OP wants to do: / /1. Create the impression of more bass by generating harmonics of the bass signals that the speaker can't reproduce, or / YES /2. Create a new bass signal one octave below the original one. NO, that is not what I'm trying to achieve. The latter would be pointless when using a 2" speaker./ /The first can be done in a limited frequency range. If your speaker goes down to 120 Hz or so you can get the impression of lower bass *by generating enough harmonics (both even and odd) of the 50..120Hz range. *If the speaker cuts of at 250 Hz or so then just forget it, it won't work. Some of the people I work with have tried to do this for the tiny speakers used in smartphones, all they got was distortion without more bass. Even in the frequency range where it works it's not an easy effect to get right. / This is the problem, I was searching for aplugin that generate all the harmonics, and I could only generate second harmonic which translate in shifting the signal one octave up, I could not succeed adding second, third, forth, ... harmonics and I have no idea how to do it. My speaker, in the 5L box (the one I'm playing with for this experience before to apply it to the 0.5L box) can reproduce sine wave down to around 60 Hz with some volume (dB). So, I guess, it could be done according to your saying. A little Hope here Thank you for thinking and for your answers/advices. Best regards, Jean -- View this message in context: http://linux-audio.4202.n7.nabble.com/LADSPA-Plugins-from-ALSA-would-like-s… Sent from the linux-audio-user mailing list archive at Nabble.com.

On 09/07/16 13:48, Tweed wrote: oops, correction: "(musically, the octave and octave plus 5th above that)" should have read, "(musically, the octave and octave plus 5th above)" -- www.the-temp-agency.com/lollipop-factory

On Wed, September 7, 2016 11:06 am, bricolodu wrote: big, 60 Hz is not so bad, so maybe two different settings for the 5l box and the 0.5l box. What you are trying should work OK with the 5l box. I'm not sure about the 0.5 l box, that will depend on the low frequency cutoff for that system, which Too high, if the box can output to 60Hz, then the cutoff should probably be around 60Hz to 80Hz (see what sounds best). The idea is to fool the ear into hearing what is not produced, with the low pass at 200Hz then you would add extra harmonics to frequencies which are being produced by the speaker already, that will likely make the sound "muddy" or "thick," maybe you would use some other word to describe, but probably will not be the sound you want. Yes, my assumption is that if the speaker cannot make audible output at those low frequencies, if you send the low frequencies anyway it will add distortion. Since that is what you are trying to do with the plugin, obviously the speaker does not add distortion in a way that you find sounds good, so best to avoid it. The lowest frequency where the speaker has full output. I think by the way you described the 5l box that would probably be around 50Hz or 60Hz (since you said 30Hz is very attenuated definitely above that). That is probably around the limit where this technique could work. Even 150Hz is a bit high, 100Hz or 80Hz would be better. OK, you may be in the right direction, just off in the settings. Try lowering the high pass to 100Hz or lower, let the speaker play what it can play naturally, and only add in harmonics for frequencies the speaker cannot play naturally. The speaker can play 100Hz to 200Hz no problem, so don't make changes there. I do not know the answer to which plugin would work best to generate the harmonics. Perhaps someone can suggest a plugin more suitable, but you can start by experimenting with the changes to the filter frequencies. -- Chris Caudle

[bricolodu] A while ago I designed a LADSPA plugin that enhances bass perception through selective harmonic generation, have you tried it yet? http://quitte.de/dsp/caps.html#Spice Cheers, Tim

Did you compare the result of harmonic whatsoever tools and tube simulations with just using an EQ? If a clean sound shouldn't be required, you maybe should compare a compressor with the faked tube saturation. If an EQ can't produce the wanted clean sound, then simply because either frequencies are missing, e.g. caused by the amp, or they aren't available by the audio source or because the speaker can't produce those frequencies. Adding some magic harmonics can't replace missing frequencies. If a biased sound is ok, IOW you don't use the setup to mix audio productions, you should consider to compare a controllable tool, such as a compressor, with some magic, uncontrollable tube saturation fake. Regards, Ralf

Hello Ralf, The goal of the project is a small portable audio system. There is no display, and although I could add a web server, I dont want peaple to tweak the system, because the average user just don't care, He just want to listen to his music. Yes I'm trying to add psychoacoustic bass, because the speaker is so small. Of course, I can EQ and I will. I may use a convolution engine. On the Raspberry Pi 2 and 3 I have Jack + jconvolver running fine., Here, with this project I'm using a Raspberry Zero. Not enough horse power to run jack and jconvolver? I will try to use a Ladspa plugin on a single channel (it is a mono system), if not possible, I'll use an EQ. But still I want harmonic, because of the tiny speaker, with EQ,only I will explode it ! Best regards, Jean 2016-09-08 18:00 GMT+02:00 Ralf Mardorf [via Linux Audio] < ml-node+s4202n101110h35(a)n7.nabble.com&gt;gt;: -- Cordialement, Jean -- View this message in context: http://linux-audio.4202.n7.nabble.com/LADSPA-Plugins-from-ALSA-would-like-s… Sent from the linux-audio-user mailing list archive at Nabble.com.

Hello Jean, Sorry to hear that. I'd be grateful if you could tell me what settings and input signals you used, and in what way the result sounded bad to you. Thanks, Tim

Hello Jean, Oh, no offense taken at all, I just want to make sure my plugins are at least working as intended, and perhaps even of some use :) If you haven't played around with the settings, perhaps these will produce a more noticeable result: lo.f=400 lo.compress=1.0 lo.gain=0.3 hi.gain=0 Thanks for your time, Tim

Hello Tim, I have done a third test on the 2" speaker, with a around 0.4L box and the results are very good, indeed. I have changed a little bit the settings lo.f=280 lo.compress=1.0 lo.gain=0.6 hi.gain=0 2016-09-10 21:14 GMT+02:00 bricolodu &lt;jean.beauve(a)gmail.com&gt;om>: -- Cordialement, Jean