MOTM

hi jb,
and: wow! thanks!! this has been very clear! thanks for writing this!

i did find something 'strange' in the 2600 book, while searching for 
the text you mentioned in your reply.

on page 39 (ring modulator) of the arp 2600 book there's a drawing of 
ac-coupled *low frequency* square and saw waves (these are dc 
normally, right?). 

these do not look like i would have expected.

it seems like the squarewave has been shifted partly upward and 
partly downward, and the saw has been in an accident :)

is this because they are low frequency waveforms? 

> The MOTM 110 is AC coupled -- it will not pass a DC signal. the 
majority of 
> uses for a VCA in a modular synth are to control an audio signal. 
The MOTM 110 
> is perfectly suitable for this type of use. However, there are 
times you will 
> want to gate a control voltage which may have a DC component 
(offset), and the 
> 110 won't work for this application though the MOTM 190 will IIRC.

so, i can't use the 110 to vc an enveloppe (which is a 100% dc 
voltage)(eg into audio in of vca). (the eg cannot be morphed into an 
ac waveform, right?)

but using a pulse lfo instead of an enveloppe would work because the 
pulse gets ac-coupled by removing some dc-component/offset, makin it 
an ac-waveform?

(is this correct?)

> Get the Allen Strange book, "Electronic Music"

i will. i found this on the web:

"My text, Electronic Music, has been reissued by McGraw-Hill Primus
Editions. It may be difficult to get in Europe so if anyone wants a 
copy
please contact me direct at <astrange@...>

I can send you copies at my cost + shipping/etc which should be well
under $40.00 US each 

Cheers-

Allen Strange "

greetings,
chef!