Jade Starr Music

Philicorda

by AudioThing

Emulation of a 1960s transistor organ with vibrato and spring reverb

Jan 30, 202459 minWatch on YouTube ↗

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  1. 16:34Vox filters taken out one at a time, then the octave selectors
  2. 18:50The overdrive, switched on and driven
  3. 21:39The spring reverb
  4. 25:45Leakage dial, bleeding the second octave into the sound
  5. 28:36Key click isolated with the notes silenced
  6. 30:22Speaker simulation changing the tone

What it does

An emulation of the Philicorda transistor organ, modelled on the later GM751. Five vox filters decide which frequencies pass and a bank of octave selectors stacks the registers, with nothing audible until at least one filter is open. Around the original circuit sit an overdrive, a vibrato, a spring reverb, attack and release, a bias control that shifts the balance between the internal oscillators, adjustable key click and a leakage dial for bleed from the second octave.

In the demo

Jade starts with everything switched off and brings the filters and octaves back one at a time, so each register is heard on its own, then works through the overdrive, vibrato and spring reverb. She plays a clip of the hardware for comparison and builds an ambient piece from four instances driven by Zoa.

Worth knowing

The filter and octave buttons signal on or off only by a change of colour, which takes some learning. It models one specific instrument rather than combo organs in general.

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