Quirk #4: setting Q PEAK will alter the tone
There is no “correct” setting for this. It’s like adding Tabasco sauce to your soup. Some
people will crank this all the way up, others all the way down. Start in the middle and
tweak to taste. Use several waveforms/amplitudes to hear what difference it makes. If you
can’t decide, leave it in the middle.
The Full/Half switch is for the 1V/Oct input jack. Full means “Full tracking” or standard
1V/Oct. The Half position is for emulating a GX-1 MOTM-485 pair of filters. The GX-1 has 2
filters in series: HP at Half tracking followed by a LP at Full tracking. So, if you really want
a GX-1 sound, you need 2 MOTM-485s. The OUT of the first goes to the IN 1 of the second:
the first VCF is a HP response with Half-track. The second VCF is LP mode with Full
tracking. The keyboard CV feeds both 1V/OCT jacks (via MOTM-910 mult) at once.
The trimmer TP1 CV OFFSET is like the FREQ panel knob in parallel. It allows you to set
the “default center frequency” of the module for a given FREQ pot setting. For example, you
may prefer bass sounds, so you can set the FREQ pot tick to “5” to be 220Hz by adjusting
TP1. Or, set the “5” tick to be as high as 3Khz with the trimmer at the other extreme. If you
can’t decide, leave it in the middle and this makes the “5” tick around 800Hz.
The advantage of using 2 MOTM-485s in series is that now you have independent control of
resonance and “bandpass frequency” (just like in the MOTM-480 CS-80 VCF).
MOTM-485 Hacks
•
R15 sets how far external voltages sweep the resonance. Lower it for a wider range.
•
You can adjust R37 and R23 to alter the feedback for resonance.
•
You can play with the filter caps. C10 and C11 must be the same, and C12 has to be
2 times C10/C11.
If you still cannot get the module to perform correctly, please contact us by phone at (817)
498-3782 or by email to [email protected]
SYNTHESIS TECHNOLOGY
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MOTM-485 ASSEMBLY 8/11/05
WWW.SYNTHTECH.COM
Содержание MOTM-485 GX-1 Diode VCF
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