blackhole does not drive UGen arrays past index 0

[nshaheed]

When feeding an array of ugens into blackhole, only the first ugen is actually driven. This is because hole is just a single-input ugen, so any mulitchannel input is just ignored. The workaround is to connect all ugens in the array to blackhole individually.

I'm not really sure how this could be fixed in a way that isn't super hacky or involves completely reworking how mulitchannel works.

Here's an example:

SinOsc s[2] => blackhole;

while(10::ms => now) {
    <<< "s[0]:", s[0].last() >>>;
    <<< "s[1]:", s[1].last() >>>;
}

And the output:

s[0]: 0.941764 
s[1]: 0.000000 
s[0]: 0.610836 
s[1]: 0.000000 
s[0]: -0.564247 
s[1]: 0.000000 
s[0]: -0.959560 
s[1]: 0.000000 
s[0]: -0.028794 
s[1]: 0.000000 
s[0]: 0.941764 
s[1]: 0.000000 
s[0]: 0.610836 
s[1]: 0.000000 
s[0]: -0.564247 
s[1]: 0.000000 
s[0]: -0.959560 
s[1]: 0.000000