The GForce’s Oberheim DMX has three built-in master effects:
They are routed serially in that order.
Each effect can be turned on or off via the red LED in the top left of each effect section.
It’s also possible to lock any or all of the effects so that you retain your current effects settings even when changing patches. To activate the Lock, click on the padlock at the top-right of each effect, whereupon it’ll become ‘greyed out’.
This determines the cutoff frequency of the filter, effectively acting as a tone control in conjunction with and depending on the position of the Filter Mode buttons.
The buttons below the filter cutoff knob determines whether the filter will act as a Low-Pass filter (LP), a Band Pass filter (BP) or a High-Pass filter (HP).
Determines the filter resonance at the selected cutoff frequency. When this knob is fully counter-clockwise, the filter resonance is at a minimum; as it is rotated to the right, the resonance increases. At maximum resonance, the filter strongly amplifies any input signal components within a semitone or so of the cutoff frequency. Still, it virtually ignores components that are not near the cutoff frequency. In other words, a pronounced peak occurs in the filter frequency response as the resonance increases, which grows higher in amplitude as it narrows in width. When the centre of the peak is at exactly the frequency of an audio input to the filter, a relatively weak signal can drive the filter to produce a very strong output.
As the name suggests, this alters the Drive of the Distortion effect. It controls the amount of gain or amplification applied to the signal. Increasing the drive increases the intensity of the distortion effect, adding more harmonic content, roughness, or "grit" to the sound.