Doepfer

Hi,

Thanks for all the replies.

Dieter wrote:
>In principle that's possible but the sound quality becomes very poor from
>our experience if several BBD circuits are daisy chained. For longer delay
>times I'd recommend digital delays

I'm not looking for very long delay times or super hifi delays.  The 4096 
stage bbd can be run to about 250ms before the necessity for filtering and 
noise reduction starts playing a significant role in the sound.  So 500ms 
would be good.  I'm pretty sure that's all the modcan delay will be able to 
do before it starts getting either really noisy or really dark because of 
the filter.  At 8 seconds there will be very little of the original signal 
left (not that this is necessarily a bad thing).  Even the very best 
analogue delay (the echoczar, by all accounts) only gives about a second of 
delay before the laws of physics start kicking in.

So how would one chain two 188-1s together?

Dieter wrote:
>(P.S. we are working on a voltage>
>controlled delay module that is not based on BBD, details will follow as>
>soon as the prototype is working).

I'd be very interested in such a module but please, please, please include a 
feeback loop send and return.  Actually I'd be utterly delighted if the 
digital delay resembled in the 188-1 in all ways other than the delay 
creation mechanism itself.  I think the 188-1 is the very pinnacle of what a 
modular module should be - everything CVable, no extraneous circuitry (like 
filters) and the signal path completely interruptable :)

rgds

Pierre

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> So how would one chain two 188-1s together?

1. Connect clock out of A-188-1#1 to clock in of A-188-1#2. Use the shortest
cable you have (30 cm or less). The clock oscillator of #1 is now used to
control both devices.
2. Connect BBD out #1 to audio in of #2
3. Connect BBD out #2 to ext.Feedback in #1

I'll take a look at our prototype box. As far as I remember we have built a
prototype during our first BBD researches that had four daisy chained BBD
circuits on board (e.g. four MN3005 to obtain 16384 steps). But we cancelled
the version with multiple daisy chained BBD circuits because of the poor
audio quality. But if one wants to use it as a special effect it might make
sense.

Best wishes
Dieter Doepfer