Tascam 4 Upward tuning reference, Downward tuning reference, Velocity Time, Velocity Response

Upward tuning reference

Selects the PRF’s ‘Upward long’ interval tuning reference. 1-31 = specified in semitones, 0 = defaults to octave. The ‘Upward short’ interval tuning reference is fixed at a minor third (3 semitones).

Downward tuning reference

Selects the PRF’s Downward long interval tuning reference. 1-31 = semitones, 0 = defaults to octave. The ‘Downward short’ interval tuning reference is fixed at a minor third (3 semitones).

Velocity -> Time

Selects the amount of portamento time modulation determined by note-on velocity (0-127). 0 = none, 127 = max. With this parameter set to a value other than 0, lower velocities will result in a slower slide rate and higher velocities will result in a faster slide rate.

Velocity Response

Selects the velocity response for the target note (0-127). With this parameter set to 0, the target note (destination of slide) will sound with the same velocity as the original note. With this parameter set to 127, the target note is subject to the full rage of the instruments velocity response. 0 = none (original), 127 = max (full velocity response).

Velocity Pullback

Determines the degree to which the PRF filter response is reduced (flattened) based on incoming note-on velocity. 0 = no filter pullback, 127 = full pullback range. With this parameter set to 127, an incoming note velocity of 127 will use the full value of the PRF filter coefficients while lower velocites result in a flatter filter response.

Slide Curve type

Selects the portamento slide curve type, either nonlinear bell-type(acoustic) or linear (synth).

Note: Because GigaStudio streams samples directly from your hard drive, transposing a sample more than three octaves above it’s root can cause unexpected results…

PRF Intervals and Filter Coefficients

There are four filter sets associated with a PRF profile which correlate to pitch intervals: Upward Long, Upward Short, Downward Long and Downward short. Each of these interval sets contains four parameters (Fc, Q0, Q0H, V0) which are explained below. As a sample is transposed up and down the keyboard, the PRF continuously tracks the samples pitch and morphs between the appropriate interval sets.

Upward Long – Controls the target filter settings for the Upward Long Interval as defined by the ‘Upward Tuning Reference’ value.

Upward Short – Controls the target filter settings for the Upward Short Interval which is fixed at three semitones.

Downward Short – Controls the target filter settings for the Downward Short Interval which is fixed at three semitones.

TASCAM GigaEditor 4 Manual 203