Analogue-sequencer

Since we are talking features on the CV side, one thing that would be great
to implement on the CV outs would be LFOs that were free running, tempo
synced, or re-triggerable by a note event.

 

James R. Coplin

 

From: analogue-sequencer@yahoogroups.com
[mailto:analogue-sequencer@yahoogroups.com] On Behalf Of Colin Fraser
Sent: Wednesday, September 01, 2010 7:30 PM
To: analogue-sequencer@yahoogroups.com
Subject: RE: [analogue-sequencer] Cirklon CV ins/outs..

 

  


> at this point I think we need more information from Colin 
> about what kinds of voltages could actually be output and 
> input and especially how the inputs could be used within the cirklon

Obviously with the CV capability still not finalised, the software support
is not final either.
The outputs will have 12 or 16 bit resolution, a range of 10 volts, and an
update rate across all channels of at least 1000Hz.
Logically, the CV outputs appear as if they were on a MIDI to CV convertor
built into Cirklon.
So far they can be assigned to output note, velocity or CC values.
The extra resolution of the DACs is used to provide linear or exponential
smoothing (i.e. glide).
In multiplex mode, I have it set to output a stream of 24 pairs of accent
and trigger signals, based on a drum map.
I've pretty much used it exclusively for drum triggering. That's what it
does best. Or, most best :-)
I'll have my real 909 on eBay before long. I just can't see me using it
again.

I don't have to be strict about the use of MIDI protocol internally, so if I
feel it would be worth providing higher-resolution step values for CV
output, I could.
But I find it pretty damn hard to pick out more than 128 discrete positions
on a knob, so its more important to me that transistions between values can
be smooth.
That is something that can be easily achieved by allowing a pattern to
switch smoothing of CC values between steps on and off as part of the
pattern, and using the extra DAC resolution to make the slope zipper-free.
Only the length row of a P3+ pattern has higher than MIDI resolution as yet.
There is scope to make the aux rows 12- or 16-bit if desired.

For CV inputs, there would be a conversion to a logical MIDI stream.
If it were converted to a note, velocity or CC value routed to the realtime
record input, it could be used to capture sequences from external devices.
Routed to internal track control parameters, it might modulate
note/velocity/length/delay offset or scaling, pattern settings like
direction and tbase, or the equivalent of P3 play-mode knob input for aux
events (so allowing control over masking of events, depth of randomisation,
etc.)

All this is flexible.
Just as with P3, I expect the final implementation to be strongly influenced
by user input other than mine.
It will launch with a very capable OS, but it would be foolish to try to
make it 'finished'.
There is plenty of scope for fun ;-)
The Cirklon CPU out-runs a P3 by about two orders of magnitude, and the code
space is only a third full.

Best regards,
Colin Fraser
Sequentix Music Systems Ltd
http://www.sequentix.com





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