Doepfer

> yes that would be a very nice aproac to it.
> also:
> -every grain could even be externally trigered by an lfo or oscilator.
Yeah, that's basically what i meant. Let me focus on a grain playback  
module. It would get it's source files via USB, up to one file per  
voice, or possibly from the memory of a possible other grain module  
( like a realtime memory recorder....). One voice would have the  
following inputs/functions:

- trigger input to start playback of a grain.

- 3-way trigger-mode switch
--------mode 1:   starts a grain on every trigger; if a new trigger  
arrives while a grain is still running, the voice crossfades to the  
new grain
--------mode 2: starts a grain when a trigger is received UNLESS a  
grain is already being played back. the trigger signal is forwarded  
to a trigger output socket (which could be used to trigger a  
different voice)
--------mode 3: sampler mode, where the input expects a GATE rather  
than a trigger. rising gate will start a grain, which will continue  
playing looped while gate is high

---trigger thru socket which forwards either the trigger signal like  
a multiple (mode 1), routes non-played triggers thru (mode 2) or  
outputs a trigger whenever the loop "turns around" (mode 3)

--- "grain is playing" gate output: outputs a gate whenever a grain  
is being played, gate becomes low when the grain fade-out starts (so  
you wont get just a permanent high level in case of mode 1 and  
overlapping grains); this makes triggering envelopes etc for  
processing grains possible

- manual control and attenuated CV input for grain length:   these  
values will only be evaluated at grain start time

- mode switch for grain length
--------mode 1: absolute mode #1, where a CV of 5V results in a grain  
length of 500ms
--------mode 2: absolute mode #2, where 5V = 2.5
--------mode 3: relative mode, where 5V equals the length of the  
entire file in seconds

----grain length CV output, that outputs the current grain length as CV

- manual control and attenuated CV input for grain transposition;  
only evaluated at grain start

- attenuated CV input for grain pitch; evaluated in realtime at  
sample rate (for "pitch jitter" effetcs or envelope control of pitch  
variation during a grain etc)

---- pitch CV output, which is the transposition (in S/H form as used  
by the grain module) plus pitch CVs summed

- manual control and attenuated CV input for grain start location  
within file; only evaluated at grain start

- grain start location mode switch:
-------mode 1:  relative mode, where 5V = last sample word of file  
(in which case a grain would start at the beginning of the file); the  
manual start time control acts as an offset and has a range over the  
entire file
-------mode 2: absolute mode, where 5V = 1 second; manual control is  
offset as in mode 1
-------mode 3: stepped mode, where the CV input is quantised into 16  
or 32 steps, which step through the file in 16 or 32 equal steps  
(making beat-rearrangement possible etc); manual control is an offset  
for fine-tuning the virtual "1" of the file.

---grain start CV output, which outputs the starting position within  
the file of the current grain, where the last sample word of the file  
equals 5V, updated on grain start

--- current playback position CV output, which outputs the current  
position within a grain (!!) as a CV, where start of grain equals 0V  
and end of grain equals 5V....this is basically a rising ramp at the  
length of the current grain, or a sawtooth oscillator in case of  
looped playback. yummy!

- manual control for fade-in/out time of the grain from 0 to 50% of  
grain length value OR absolute from 0 to 20 ms dpending on the state  
of the

- fade mode switch as described above

--- fade envelope CV output, which outputs a rising ramp while grain  
fades in, falling ramp while grain fades out and 5V while grain is  
playing

- grain playback direction switch and gate input where 0V = forward  
and 5V = reverse. when in looped mode 5V means alternating forward- 
backward loop

- grain audio output



This would result in a total of 14 sockets, 9 pots and 4  
switches......so a 4-voice module would basically be around the size  
of an a-154 + a-155 combo.

Gotta forget about the 8-voice. Just get two or three of the 4-voice  
ones.

Yeah.


Oh and whoever builds this, get me a free one ;-)



l8a,
d