scsynth.exe vs VoiceMeeter for online teaching

Hi,

Bit of a strange issue -- I don't think I have enough info to log as a
bug. And we might end up deciding that it's not worth investigating,
but...

Because of an interesting chain of events, I've had to move my online
teaching from my Linux machine (where Zoom Meeting had been working
quite well) onto a Windows machine.

Piping audio apps into the meeting was relatively easy in Linux --
just manually connect the JACK sources to the PulseAudio input. JACK
mixes the audio with my mic and everything works.

Not so easy in Windows. I heard a while back from some students about
a Windows audio-routing app, VoiceMeeter, which works a treat with
just about everything I'm using.

Except... SuperCollider.

I've got:

- Audacity: PortAudio --> VoiceMeeter input -- works great.
- Ardour: PortAudio --> VoiceMeeter input -- works great (with a slight tweak).
- Pure Data: Not sure which audio library it's using --> VoiceMeeter
input -- works great.
- SuperCollider: PortAudio --> VoiceMeeter input: boots up but playing
SinOsc.ar(440) produces only some randomly-timed very low frequency
pulses.

Audacity and Ardour tell me that there isn't an inherent problem with
PortAudio --> VoiceMeeter. But there is a problem somewhere in the way
that *we* are using PortAudio.

One other data point: Ardour shuts down VoiceMeeter's audio i/o, but I
can restore it by reselecting the output device in VM's console (and
then it all works fine). If I try the same trick with SuperCollider,
VM complains that the device is not available and there's nothing else
I can do, except quit scsynth. (Again, not an inherent problem with
PortAudio, as Ardour handles it better.)

On the one hand, it's an atypical use case.

On the other, it's a limitation for long distance educators (that is,
basically all educators now) who, for whatever reason, are unfortunate
enough to be stuck with online meeting software that doesn't support
Linux.

So I'll just throw that out there and see if anyone bites.

hjh

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