PotD - The Organ Grinder

Featuring the Plan B Model 23 Analog Shift Register.



The Organ Grinder plays his merry tune. All is well until monkey and Schnapps get the better of him:

PotD - The Organ Grinder  by  navs

In this patch the M23 was used to shift a quantized sequence to a pair of detuned VCOs, the 'both' input of a Bananalogue/ Serge VCS and the CV input of a VC-LFO. The sequence was transposed by the stepped output of a Wogglebug. A sequential switch was used to alternate between a 'regular' and voltage controlled clock. The switch was triggered by a comparator reading the output of a second random source.

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UPDATE: Patch details

I tried to keep the patch description as simple as possible, but for those of you who want to try this here is a patch chart.

The A-147 VC-LFO acts as the master clock and feeds the SQ8, which sends a gate to the VCS (or Maths).

The envelope generated by the VCS is patched to the output VCA. In my patch I fed the two VCOs to a separate mixer (VCA-4MX) before the final VCA (VCA-2P), but for simplicity I've shown an A-131 in this chart.

The sequence generated by the SQ8 goes to an A-156 quantizer, the CV goes to the ASR and the trigger output of the A-156 clocks the ASR. From there, output one goes to VCO1, output 2 to VCO2, output 3 to the second input of an A-151 switch and the last output feeds the 'both' input of the VCS.

The random elements:

the 'step1' output of the SQ8 clocks the Wogglebug. In turn, its clock output steps the S&H/ noise.

The Wogglebug's stepped out feeds the transpose input of the quantizer. At the beginning of the patch I kept the randomness to about 9 o'clock, towards the end I swept it up manually and then back to zero.

The SH-NZ output feeds an A-119, which I've used as a comparator. Depending on the gain & threshold settings you can generate an amplitude-dependent gate. As the A-151 feeds the CV-in of the VC-LFO, the gate toggles the switch between 'regular' and VC-clock. As an alternative, you could use a VCA to alter the amount of VC-clock or, indeed, alter the CV amount manually. If you don't have a comparator or A-119, you could use the burst output of the Wogglebug. I sometimes find this too frenetic, so I send the burst gate to a clock divider to calm it down a bit!