[A6] Some waveform observations II.

[Michael E. Caloroso]

> 
> Actually these asymetrical waveforms sound more interesting than 
> mathematical correct ones. But to enable "correct" FM I found following 
> trick:
> 
> To the modulator's sine, add the rectangular waveform with a pulse width 
> of 100% and an amount of about 2.0 . This compensates the DC offset 
> caused by the asymetrical waveform, where the mean value is not equal 
> zero. Now modulate linearily by an EG, and bingo, there is a 
> Chowing-like sound in tune. Next step is to modulate VCFs with the same 
> method, to have 4OP-FM ...
>  
> Polyphonic mode is possible, but the rectangle amount is a very sensible 
> value to get all voices in acceptable tune.
> According to that I would say the detune FM artifacts between voices are 
> due to small differences in waveform assymetry. They cause different DC 
> offsets and different tunes. The reason are not some VCAs which can't be 
> calibrated in the tune process.

Souix, you can add this one to the T&T document...

MC