> Korg Poly-800 Filter cutoff modulation details The source three pole switch also has an central position to off this mode. The switch allows you to select DCO1 or DCO2 as source for the modulation.
Korg poly 800 battery mod#
This effect works best with the resonance cranked up into self oscillation which is where the new resonance knob mod comes into its own. Essentially this mod allows you to modulate the LPF cutoff by the audio frequencies from DCO and create all kinds of clanging cross modulation and bizarre alien splatters & sweeps. You can desolder C103 and add wire from these pins to the switch on front panel.įor any connections between PCBs and controls on the front panel I recommend use only shielded audio cables where each shield connected to the GND on PCB. This will significantly reduce unwanted interference.įilter modulation: This mod consists of switch to select a source and the modulation amount knob. For this just add two-pole switch that will select signal output from pins 5 or 6 of IC1 to capacitor C103 on the main PCB. In addition to the instruction above you can also add 12 / 24 dB switch for the LPF. This mod adds a switch to select either a 24 dB or less drastic 12 dB filter response. Both parameters are still also controlled by the normal programming methods which can set the range of the knobs control.ġ2 / 24 dB switch: Somewhat mysteriously the filter chip used in these machines has both 12 and 24 dB/Oct outputs but only the 24 dB one is actually used. The filter cutoff knob allows you to perform long filter sweeps for those squidgy burbling analogue lines that you knew your Korg was capable of but could never actually program. This can produce the kind of screaming top end and subsonic bass that gives these machines a whole new range of sonic possibilities. The resonance knob can take the resonance well into self oscillation and far beyond what is programmable from the front panel. The second is the so-called FM800 mod, which adds frequency modulation of the filter cutoff by the output signal from DCO.Ĭutoff & Resonance knobs: This mod can be found around the net under several different names and versions but essentially it adds knob controls for the low-pass filter cutoff and resonance parameters for realtime control. The name probably should be taken with a pinch of salt, but there is no doubt that the filter really comes to life with additional controls. The first adds knobs for low-pass filter cutoff and resonance to the front panel and also switch between 12 / 24 dB modes.
Korg poly 800 battery mods#
There are two most popular and relatively straightforward mods for this synth.
> More about Korg Poly-800 (Vintage Synth Explorer) Widely considered to be Korg's answer to Roland's affordable Juno series, the Poly-800 employed similar digitally controlled oscillators to offer early 80s consumers an alternative to Roland's budget model. In standard form, the Korg Poly-800 is a pretty decent synth. Before my experiments on creating multilayered and multitimbral samples for new presets for the SynthScaper app, I made some modifications the one of hardware synth that I would like to use for this.
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