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In-depth Feature:  Gforce Oddity
Bruno writes: .

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Nitty Gritty...
The LFO has an adjustable rate of between 2Hz and 20Khz, and outputs both Sine and Square waves; it can easily be synced to the sequencers tempo and retriggered by keyboard note on information.

Running in tempo sync, the LFO rate can be adjusted in note lengths, allowing for tempo synced arpeggios to be easily created.

Next is the Sample and Hold module, this creates random steps from a number of selectable sources, which can be used to trigger either the VCOs or the Filter, an output lag control is used to adjust portamento or glide between these steps.

The Audio mixer is where all these parts are balanced to create a signal to feed into the Filter circuit, as mentioned earlier, it is here that you choose the VCO waveforms. Here you can also mix in Noise or Ring Mod, the noise is switchable between white and pink and can be used to create hissing and rumbling sounds, adding an element of pink noise to a low bass sound increases apparent distortion and size, a very useful feature.

Ring Mod is a complex waveform derived from the sum and differences of the two VCOs, using different Pulse Width and Sync settings you can create percussive and metallic sounds, they may not track in pitch, but they will have a strong and unusual character.

Next to the audio mixer are three sliders for mixing the Keyboard tracking, Sample and Hold, LFO and Envelope outputs, these are control voltages and effect the way in which the filter responds to audio.

The Filter itself has two sections, the main VCF consists of controls for frequency cutoff and resonance, the cutoff range is from 15Hz to 15Khz, and the resonance can be made to self-oscillate, watch your speakers and audio card, as the strength of these signals is quite amazing.

The second Filter section occurs after the signal has been fed into one of the Oddity’s two envelope generators and is a simple High Pass circuit, it rolls of reasonably steeply, and can be used to completely remove bass or, in conjunction with the VCF frequency, create some great band pass filter effects.

The two Envelopes, one AR and one ADSR can be adjusted to repeat, or gate via note on/off signals, when set to repeat, the envelopes are triggered by the LFO. Two additional sliders at this end of the synth allow adjustment of velocity to VCA and velocity to VCF, this touch sensitivity was not available on the original Odyssey.

Finally a VCA gain slider increases output level, although with the low pass filter open, and the envelope keyboard gate turned off, this can cause a sound to sustain continuously.

More Resources              Articles - full listing
  • Gforce WWW
  • Arp Odyssey @Synth Site

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