After my last reply, I re-read your original post and the other comment. I see that he does say that the resulting sequence would be half the range of the original, and I see that you specify that your goal is a sequence that is never the same. I think your original setup was basically correct for what you are trying to generate, but I think it was just hard to distinguish between a fully random output and the SQ-10+S&H combination. I believe if you could monitor the three outputs at once (SQ-10, S&H, and Combined output from quantizer) you would see that they are all different and you weren't hearing either/or during your initial experiment. (If you have a multi-input soundcard and enough VCOs, you could record the audio outputs of all branches from this patch at the same time and compare the patterns. I could maybe do this and provide an example, but I'm not really supposed to be moving around at the moment following an injury at work, crushed my foot). You need to have a very small amount of S&H added to maintain a recognizable relation to the original SQ-10, but ALSO if you are using the A-156 to quantize, keep in mind that it does not process negative voltages. Any combined step (SQ-10 value + a negative S&H value) with a negative voltage will output as Low C from the quantizer. This may cause several notes to be the same in each bar, so some offset may be required at the SQ-10. For example, if you patch an LFO into the A-156, half the notes output (all notes during the negative phase of the LFO shape) will be Low C. The lowest-generated SQ-10 voltage must be greater than the negative range of the A-148.
If using the colored noise as the source for the random/A-148, narrow the range by adjusting the Red and Blue dials on the 118 as well as using the attenuator on the mixer. To get a random offset of just -/+1semitone would require some very fine tuning of the S&H mix level.
Nick
Sent from the future
Hi,
I'm trying to create a randomised sequence. I have an analog sequence of volta going into a quantiser via an A138 Lin. In another channel of the 138 I have a S&H voltage. The S&H is derived from an A148 clocked by the same trigger as the sequence and with the sample being Random control from an A118. I expected that the random S&H voltage would "push" the sequenced notes slightly - so the sequence would be related to the original but never the same. What I get is the sequence or the random - whatever settings I use in the mixer.
So what have I got wrong / not understood
David
www.movingisliving.co.uk
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