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VCVRack / Befaco

Befaco Eurorack modules for VCV Rack
https://library.vcvrack.com/Befaco
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PonyVCO. Output goes to 'nanV' while FM'ing at sample rates of 192 or 768 kHz. #40

Closed stnslvk closed 1 year ago

stnslvk commented 1 year ago

In case 'Filter TZFM DC' option is enabled, PonyVCO's output goes to 'nanV' while FM'ing at sample rates of 192 or 768 kHz.

To reproduce

There is no issue in case Rack operates at sample rates other than 192 or 768 kHz.

Rack Engine SR is to 48 kHz - ok Rack Engine SR is set to 176.4 kHz - ok Rack Engine SR is to 192 kHz - issue Rack Engine SR is to 352.8 kHz - ok ... Rack Engine SR is to 768 kHz or higher - issue

Win 10
PonyVCO 2.3.0
Rack Free Standalone 2.2.1

2022-12-13_034446

2022-12-13_034651

2022-12-13_034738

hemmer commented 1 year ago

Thanks for the report, I can reproduce and will take a look at some point. Quite a confusing bug though!

hemmer commented 1 year ago

Ah I think it's the TZFM DC blocker blowing up, as a workaround until this is fixed - if you disable this from the menu, does the issue go away?

stnslvk commented 1 year ago

Hi Ewan, thanks for looking into this. Correct, the issue occurs only if 'Filter TZFM DC' option is enabled - forgot to mention this in the description.

Also, please have a look into 'Timber' behavior. With the same conditions, PonyVCO output goes to 'nanV' when it set to the max (1) value.

hemmer commented 1 year ago

No problem - could you clarify your second point there with a picture? I can't reproduce that so far.

stnslvk commented 1 year ago

Interesting, cannot reproduce that on a freshly added PonyVCO instance either. Maybe there was some additional steps i took earlier . Will provide additional info a bit later.

stnslvk commented 1 year ago

Further related findings are here #41

hemmer commented 1 year ago

I think the DC filter is unstable - it uses normalised frequencies so 5Hz / 192kHz is just too small a normalised filter frequency to be used. I switched to RCFilter which is stable even at those rates. There are new builds, can you confirm that this fixes things for you?

stnslvk commented 1 year ago

At first sight the issue is addressed. There are no more 'NanV' at output. Happy to close this one. Ewan, thank you.