20 Jun
2008
20 Jun
'08
7:40 p.m.
Are you running a real-time kernel (rt)?
rt kernel is pretty much essential to avoid snap,crackle and pop.
Get the name you always wanted with the new y7mail email address.
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20 Jun
20 Jun
9:03 p.m.
New subject: Crackling in ZynAddSubFX
On Fri, Jun 20, 2008 at 6:40 PM, Norval Watson <norv2001(a)yahoo.com.au>
wrote:
Are you running a real-time kernel (rt)?
Yes, I am. It's the default kernel in Ubuntu Studio. I get almost no Xruns
in JACK too, so as far as I know, its a separate problem. I have noticed
though that one of the few times I'll get one or two Xruns is when I switch
instruments within ZynAddSubFX. Not sure if that matters.
In case its helpful, here's some of my JACK settings:
Realtime: checked
Monitor: checked
H/W Monitor: checked
H/W Meter: checked (I'm not sure why I have these last two boxes checked,
does it matter?)
Frames/Period: 64 (I've tried 128 too, and that didn't seem to change
anything with ZynAdd)
MIDI Driver: seq
Sample Rate: 48000
Periods/Buffer: 2
Port Maximum: 256
Timeout: 500
As for ZynAddSubFX settings, here's some of the relevant ones:
Sample Rate: 48000
Buffer Size: 256
OscilSize: 512
PADsynth Interpolation: Linear (fast)
Append: checked
XML compression level: 3
Any ideas?
10:36 p.m.
New subject: Crackling in ZynAddSubFX
After a little more experimenting, I found a little workaround for this
issue... although it's still doesn't exactly shed any light on what's
causing the problem. I figure I'll post it here to this mailing list, in
case someone with more experience might know what's going on here.
I noticed that every time I switched to a different instrument in the
ZynAddSubFX instrument bank, I would get an Xrun in JACK. Then I'd start
hearing the crackling sound. The crackling didn't show up at first, only
until I switched instruments. I found that if I disconnected ZynAddSubFX
from system in the JACK Connection's Audio tab and then reconnected it, the
crackling goes away. If I switch to another instrument in ZynAdd, however, I
have to repeat this process otherwise the crackling comes back.
Another thing I noticed is that if I turn on "Verbose messages" in JACK,
normally I'll steadily get line after line of messages like this:
load = 13.6919 max usecs: 185.000, spare = 1148.000
The load number will increase and the spare will decrease as I play notes.
If I switch instruments in ZynAdd however, I get an Xrun and then the load
number goes way down in the 1.0 - 2.0 range and as I play notes in ZynAdd,
this number is unaffected. Its as if JACK disconnects itself from ZynAdd or
something, despite not giving any indication that it has done so.
Oh well. I'm content with this workaround. I just thought I'd post this info
in case it may be helpful for someone else.
On Fri, Jun 20, 2008 at 8:03 PM, Peter Lutz <peter(a)gotsomeideas.com> wrote:
On Fri, Jun 20, 2008 at 6:40 PM, Norval Watson
<norv2001(a)yahoo.com.au>
wrote:
Are you running a real-time kernel (rt)?
Yes, I am. It's the default kernel in Ubuntu Studio. I get almost no Xruns
in JACK too, so as far as I know, its a separate problem. I have noticed
though that one of the few times I'll get one or two Xruns is when I switch
instruments within ZynAddSubFX. Not sure if that matters.
In case its helpful, here's some of my JACK settings:
Realtime: checked
Monitor: checked
H/W Monitor: checked
H/W Meter: checked (I'm not sure why I have these last two boxes checked,
does it matter?)
Frames/Period: 64 (I've tried 128 too, and that didn't seem to change
anything with ZynAdd)
MIDI Driver: seq
Sample Rate: 48000
Periods/Buffer: 2
Port Maximum: 256
Timeout: 500
As for ZynAddSubFX settings, here's some of the relevant ones:
Sample Rate: 48000
Buffer Size: 256
OscilSize: 512
PADsynth Interpolation: Linear (fast)
Append: checked
XML compression level: 3
Any ideas?
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2 comments
2 participants
participants (2)
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Norval Watson -
Peter Lutz