MOTM

You make sense to me Richard.  There are obviously many variables in the
signal chain and the recorder.  Impedance mismatches, different opamp output
stages on mixers, etc. will all have an effect.  Perhaps one could compare
oscilloscope images? :)  For example there is usually a little glitch on the
top of the triangle wave (from the waveshaper) of a saw-core VCO.  There
could be differences in the rise and fall times on the triangle wave for
triangle-core VCOs.  Turn up the freq past 20KHz, what is happening to the
amplitude, to the rise-time on the square wave?  These all are inducing
changes in harmonics.  But good luck translating what you see to what you
will hear.  Side by side hearing tests - there is no good replacement for
this IMO.

George

Richard Brewster wrote:
> A recent (unsigned) post asked for WAV files of MOTM VCO outputs, 
> presumably for comparison with other VCO makes.  I would be interested 
> to know whether anyone thinks that recordings suit this purpose very 
> well.  Problems would surely dog this approach, vs. actually having the 
> modules side-by-side in the same system and doing A-B listening tests.
> 
> The files being compared could have been produced with different 
> sampling rates.  The recording levels most likely would have been 
> different.  The psycho-acoustic effects of simply playing back the 
> *same* recording at different levels of amplification can be 
> significant.  If it is indeed reasonable to make comparisons this way, 
> it seems to me that the recordings being compared would all have to have 
> been made in the same studio with all parameters kept as equal as 
> possible (as when Paul S. posts samples of different sounds for 
> comparison).  Thoughts?
> 
> Thanks,
> 
> Richard Brewster
> http://www.pugix.com
> 
> 
> 
> 
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