Alesis Andromeda A6

> My next test is to try a frequency 'sweep' and calibrate to a 
> specific set of levels.  Perhaps I can see if there truly is a reason 
> for this, other than just 'louder output'.

Well I've conducted a test with my friend last night.  We sampled
various tones, and sweeps with both outputs.  We did realtime spectrum
analysis and then FFTs of sampled sounds.  Everything was sampled at
ADAT quality (48khz), and there was NO apparent difference.  Very
small differences were found, but they could've easily been small
differences in the cables or input jacks of the console itself.  
The AUX output was slightly louder at max than the MAIN output though.
Testing the volume knob at various settings and calibrating the AUX
volume to the same peak ALSO resulted in the same spectrum. FX were
turned OFF.

Thus, it seems that the AUX outputs might be just louder and driving
the mixer inputs on some setups just enough to give it extra ooomph.  

The waveforms tested were SAW and SINE.  The low end was tested more
accurately by using the subosc to overcome the keytracking issue. 
Tone sweeps were done using VCF #2 self-oscillating and sweeping from
ultra low to ~8khz.  The pre-filter saturation when driven too hard
was seen on oscilloscope, you can actually see a sine wave morph as
you slowly bring up the osc level.  

It certainly is strange, because I thought I really heard a difference
between the AUX and MAIN.  Seems like nothing is wrong with the volume
knob or the MAIN channel with these results.