On 06/25/2018 07:08 PM, Paul Davis wrote: OK I could make a TON of jokes about that. But I looked it up and I see it's a real thing. But "as a comic in all seriousness" (How are ya! Eugene Levy as Bobby Bittman) I can say the product does really well at separating whatever notes you throw at it on the guitar. Cheers, Tim.

Le Mon, 25 Jun 2018 18:31:12 -0400, Tim &lt;termtech(a)rogers.com&gt; a écrit : <snip> To go fast and get a low enough latency, you can use can what time is between 2 consecutive peaks of the signal. Be aware than you would have to smooth the signal because when playing loud and the strings are touching the frets, the harmonic content become so weird you can get false maximums (as seen by a signal analysis of my electrical guitar with a memory oscilloscope), which will give you a much higher fundamental frequency than expected. Normal signal: * * * * * * * * * * * * * * * * * * * * * * *=========*=========*=========*==== * * * * * * * * * * * * * * * * * * Fretted signal: * * * * * ** * * ** * * * * * * * * * * * * * * * * * * * *=========*=========*=========*==== * * * * * * * * * * * * * * * * * * These double peaks can be very huge as an electrical guitar have a huge dynamic during the attack of the notes. Doing a repetitive arithmetic average calculation when the sampling are coming in must be enough to smooth them in real time, and to get ride of other high order harmonics at the same time. The latency will be dependant of the fundamental frequency, something like one period + trigger delay. Cheers, Dom -- If you have a problem and you are not doing anything to fix it, you are at the heart of the problem.

On Mon, 25 Jun 2018 18:31:12 -0400, Tim wrote: For quite some time now, the free version is installed on my iPad, but I never tested it and meanwhile I've got two electric guitars with Roland GK-3 PUs and a Roland GR-55. Keep in mind that even the best polyphonic tracking done by software for Apple and Microsoft based computers, for usage with averaged guitar pickups, at least suffers from the additional audio device latency. Before I bought the Roland gear, I watched videos and read reviews. Roland seems to be the best solution at the moment, even combinations of a Roland GR-55 with piezo bridge pickups, instead of the Roland GK-3 seems to be less reliable. However, for several reasons it indeed would be nice, if the polyphonic tracking software, for usage with averaged guitar pickups would make progress. OTOH some kind of divided pickup build into modern guitars has got an advantage, too, since modeling makes a lot of progress. My new guitar additionally has got a Sustaniac driver. IOW adding special pickups to guitars is not necessarily a disadvantage. Perhaps polyphonic tracking software, for usage with averaged guitar pickups, in combination with special pickups is interesting in the near future.

On 06/26/2018 02:16 PM, Ralf Mardorf wrote: What is truly astounding is the product's low latency. The patent mentions an ideal FFT data block of around 95mS or 4096 samples at 44100Hz samplerate. But, I know what a 4096 sample delay feels like. It's long. The latency seems /much/ less than that in this product. It sure feels like magic. I've been playing it for two nights now and it really is fast and accurate. If I understand correctly the theory goes something like this: If you are looking for a dog in a picture, far better to compare with real pictures of dogs already stored than to only have a rough mathematical idea of what a dog should look like. I highly advise to try the software. I found it amazing. There is talk of this software obsoleting using special pickups. I would tend to agree, it's pretty darn good. Ah, just looked that up. Similar to the famous e-bow hand-held sustainer? I use a novel approach: I 'sing' into my guitar neck, the neck touching my throat, which resonates the strings infinitely for as long as I can sing a note. Yeah that would be neat. Maybe someday all guitars will come with such pickups and standardized connections. From there, the sky's the limit on modeling and recognition. Tim.

On 06/26/2018 03:55 PM, Hans Wilmers wrote: From Klapuri, "Multipitch analysis of polyphonic music and speech signals using an auditory model", from PolyPitch: "The method consists of a computational model of the human auditory periphery, followed by a periodicity analysis mechanism where fundamental frequencies are iteratively detected and canceled from the mixture signal." Wow. That seems much different than all the other papers I read. Wonder how well it works, especially if applied to guitar. It sort of reminds me of how I once was part of Sony's rollout of Surround Retrieval System technology. It was TV surround speakers modeled based on human hearing, to make one pair of these speakers simulate a truer surround. Tim.

On 06/26/2018 10:25 PM, Tim wrote: I have used PolyPitch for resynthesis of violin sounds. It does detect double stops, though there were also false positives. I have no idea how it would perform with a guitar, but if you ask Nick Collins, he will give you a hint. / Hans --- Hans Wilmers Notam Sandakerveien 24 D, bygg F3 N-0473 Oslo Norway tlf.: +47 22358060 mob.: +47 92459361 http://www.notam02.no

On 06/26/2018 04:25 PM, Tim wrote: Of the dozens of papers referenced by that, this one caught my eye: "Fundamental frequency estimation of musical signals using a two-way mismatch procedure" https://pdfs.semanticscholar.org/c94b/56f21f32b3b7a9575ced317e3de9b2ad9081.… IIUC this may be more in line with how this real product works. I'm having a bit of a tough time with SC. Never used it before. First the packages in SUSE were broken, so I built from source. Now I can run the SC IDE and so on without errors. OK. Next, I had to really hack the PolyPitch cmake file to get it to install. OK. But now what? I can't seem to run any examples. Some complain of unexpected/unrecognized words, some complain of asking for Mac Cocoa. Seems some stuff was built on Mac, like PolyPitch. Any quick tips appreciated before I might pester the SC crowd. Thanks. Tim.

On Sat, 30 Jun 2018 09:49:48 +0200, Ralf Mardorf wrote: PS: You neither described why it didn't work, nor what "hack"s you are using, that it still doesn't work.