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Joel Roth | 21 Jun 2012 16:00
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copp-set causes pop with transport running

Hi,

Nama fades volume on transport start/stop
and track mute/unmute by issuing copp-set 
20 times per second.

Previously the sound changed smoothly.
Recently S. Massy reported a pop on each vol or pan
parameter change, and zipper noise during 
fades that use copp-set.

I verified this with the following setup:

# ecasound chainsetup file

# general 
-b:256 -r:50 -z:nointbuf -z:db,100000 -n:"/home/jroth/nama/test0619/Setup.ecs" -X -z:noxruns
-z:nopsr -z:mixmode,sum

# audio inputs 
-a:1 -f:f32_le,2,44100 -i:loop,Master_in
-a:3 -f:s16_le,2,44100 -i:null

# audio outputs 
-a:1 -f:s16_le,2,44100 -o:alsahw,0,0,0
-a:3 -f:f32_le,2,44100 -o:loop,Master_in

# chain operators and controllers 
-a:1 -epp:50.00 -eadb:0.00,0.00 
-a:3 -eli:1047,220.00,1.00 -epp:50.00 -eadb:0.00,0.00
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S. Massy | 21 Jun 2012 21:59
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Re: copp-set causes pop with transport running

On Thu, Jun 21, 2012 at 04:00:45AM -1000, Joel Roth wrote:
> Hi,
> 
> Nama fades volume on transport start/stop
> and track mute/unmute by issuing copp-set 
> 20 times per second.
> 
> Previously the sound changed smoothly.
> Recently S. Massy reported a pop on each vol or pan
> parameter change, and zipper noise during 
> fades that use copp-set.
> 
> I verified this with the following setup:
> 
> # ecasound chainsetup file
> 
> # general 
> -b:256 -r:50 -z:nointbuf -z:db,100000 -n:"/home/jroth/nama/test0619/Setup.ecs" -X -z:noxruns
-z:nopsr -z:mixmode,sum
> 
> # audio inputs 
> -a:1 -f:f32_le,2,44100 -i:loop,Master_in
> -a:3 -f:s16_le,2,44100 -i:null
> 
> # audio outputs 
> -a:1 -f:s16_le,2,44100 -o:alsahw,0,0,0
> -a:3 -f:f32_le,2,44100 -o:loop,Master_in
> 
> # chain operators and controllers 
> -a:1 -epp:50.00 -eadb:0.00,0.00
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linux media 4 | 22 Jun 2012 01:20

Re: copp-set causes pop with transport running

On 06/21/2012 07:00 AM, Joel Roth wrote:
> Hi,
>
> Nama fades volume on transport start/stop
> and track mute/unmute by issuing copp-set
> 20 times per second.
>
> Previously the sound changed smoothly.
> Recently S. Massy reported a pop on each vol or pan
> parameter change, and zipper noise during
> fades that use copp-set.
>
> I verified this with the following setup:
>
> # ecasound chainsetup file
>
> # general
> -b:256 -r:50 -z:nointbuf -z:db,100000 -n:"/home/jroth/nama/test0619/Setup.ecs" -X -z:noxruns
-z:nopsr -z:mixmode,sum
>
> # audio inputs
> -a:1 -f:f32_le,2,44100 -i:loop,Master_in
> -a:3 -f:s16_le,2,44100 -i:null
>
> # audio outputs
> -a:1 -f:s16_le,2,44100 -o:alsahw,0,0,0
> -a:3 -f:f32_le,2,44100 -o:loop,Master_in
>
> # chain operators and controllers
> -a:1 -epp:50.00 -eadb:0.00,0.00
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Joel Roth | 22 Jun 2012 13:58
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Re: copp-set causes pop with transport running

On Thu, Jun 21, 2012 at 04:20:59PM -0700, linux media 4 wrote:
> I'm running ecasound v2.9.0.
> 
> I took a quick look at your setup so forgive me if I'm off the mark. But 
> is seems I'm doing the same thing to increase the level of various 
> things (panning, volume, effects) and I'm not having the same problems. 
> Maybe you can try this "one command does all" and circumvent the problem...

> c-select $chain
> cop-set $chainop_id,$param_id,$value

That Nama uses copp-set instead of cop-set is entirely accidental. 

I suppose I can try cop-set, however, I expect that for Ecasound
copp-select/copp-set behaves identically to cop-set

Regards,

Joel

> Maybe there's just something in the 'copp-set' command that doesn't 
> exist in 'cop-set'

> Hope this helped,
> Rocco

--

-- 
Joel Roth

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linux media 4 | 22 Jun 2012 14:35

Re: copp-set causes pop with transport running

> On Thu, Jun 21, 2012 at 04:20:59PM -0700, linux media 4 wrote:
>> I'm running ecasound v2.9.0.
>>
>> I took a quick look at your setup so forgive me if I'm off the mark. But
>> is seems I'm doing the same thing to increase the level of various
>> things (panning, volume, effects) and I'm not having the same problems.
>> Maybe you can try this "one command does all" and circumvent the problem...
>
>> c-select $chain
>> cop-set $chainop_id,$param_id,$value
>
> That Nama uses copp-set instead of cop-set is entirely accidental.
>
> I suppose I can try cop-set, however, I expect that for Ecasound
> copp-select/copp-set behaves identically to cop-set
>
> Regards,
>
> Joel

Yeah, after sending the email, that occurred to me. Most likely copp-set 
and cop-set are two methods that do exactly the same thing.

Rocco

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