what does 

chuck —probe 

print out?  Maybe you’re connecting to the wrong dac??

For reference, here’s an invocation script I used last time 
I did a multichannel performance:

chuck -c8 -bufsize2048 -in2 --dac1 --adc0 INIT.ck

That would have been an older version of chuck, but it worked then.

PRC

> From: mike clemow <michaelcle...@gmail.com>
> To: ChucK Users Mailing List <chuck-users@lists.cs.princeton.edu>
> 
> Hi folks,
> 
> Been a while, hope everyone is safe.
> 
> I'm experiencing something very strange and feel I must be doing something
> wrong. (MacOS 10.14.6)
> 
> Running chuck on command line like this:
> 
> $ chuck --dac7 --out7 --channels4 --srate48000 --verbose --loop
> 
> Then I run this file to test outputs:
> 
> SinOsc s0 => dac.chan(0);
> SinOsc s1 => dac.chan(1);
> SinOsc s2 => dac.chan(2);
> SinOsc s3 => dac.chan(3);
> 1::second => now;
> 
> Yields this error:
> 
> [chuck](VM): NullPointerException: (UGen link) on line[3] in shred[id=1:
> speaker_tester.ck]
> 
> Note: "line[3]"... it only thinks there are two dac channels. Indeed, I can
> only get sound out of dac.chan(0) and dac.chan(1).
> 
> I get the same behavior in chuck versions 1.4.0.1, 1.4.0.0, & 1.3.6.0
> I get the same behavior in different sound cards with 4+ channels out.
> 
> BUT... the code works with 4 channels in miniAudicle!
> 
> What is going on? What am I doing wrong?
> 
> All best,
> Mike
> 
> --
> Michael Clemow
> Artist/Composer/Sound Designer
> http://michaelclemow.com
> (he/him)
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