modcan said: "
The Concept.

I began work on the idea of a Joystick CV recorder module.
After getting into it, I decided that is would be more useful as a
general low frequency sampler for recording CV signals from any source.
The finished design has 2 channels for recording and playback
and multiple sampling and playback modes.
Overall I think it is a pretty radical design which can be
used for a huge variety of modulation techniques.

Here are some possibilities.

Programmable LFO
Cook up your own wave shape and loop it
Record the output from a joystick or any low frequency
signal source like an LFO or just wiggle the offset knob on the
Dual Mixer and record the voltage.

A punch-in record mode allows multiple recordings
to be made overwriting sections of the sample.
The loop start and loop end knobs control the start and finish of the
punch in. You can have recordings of a joystick, sequencer and LFO all
in one truly whacked out control voltage modulation event.

Complex envelope generator
Store a sequence of voltages or even gates and then trigger
with the panel button or Gate input.
Also a gate output goes high when the sample is
triggered and low when it reaches the loop end.
This can be used to gate the output voltage using a VCA etc.

Sequence recorder
You can record the voltage steps AND the gate output
simultaneously and then loop the sequence for infinite
wanking. Loop start and loop end controls adjust the loop length
and can be played with in real time.

Sample modes:
Rehearse mode- Input signals are transferred to the outputs
so you can hear what�s going on. Pushing the record button
starts the sampling process and continues till memory is full.
Sampling time is from 0.5sec at 4kHz rate and as long as 200 seconds
at 7.5Hz. The quality of the sample is dependant on the sample rate.
For example: at full rate it is possible to store a 6Hz sine wave at
full 8bit resolution. At 200 seconds it is only possible to record
stepped voltage from a sequencer. This is still cool though as
a 200 second sequence is still useful stuff.
To get more out of the very long sample rates a Lag processor
can be used to smooth the output if desired.

For recording 0.5-20sec second samples the output is smooth and won't
require Lag.

Loop mode sampling:
In loop mode the panel button can be used to do punch in recording.
As mentioned above this allows multiple passes to be recorded
allowing the user to assemble a complex modulation event from a
variety of sources and then string them together.

The Input/output selector switch determines if sampling
will be on both channels simultaneously or channel 1
When using only channel one the sample duration doubles
for a whopping max time of 400 seconds.



Specs: Sample/playback rate 4kHz - 7.5Hz@8bit resolution
Input-Output 0-5V
CV inputs 0-5V
3 record modes
3 playback modes

Count LED blinks as a time reference when recording.
This is a handy way of knowing how long you have left
till memory is full.

The Loop Start LED blinks when ever the loop returns
to zero. This helps you to know where in the loop you
are during punch-in recording.

All in all it has been a blast working on this
design and I believe it is just the beginning of a line
of new control modules to come.
"