Tascam GigaStudio - Manual (Page 204)

204 TASCAM GigaEditor 4 Manual
Downward Long – Controls the target filter settings for the Downward Long Interval as defined
by the ‘Downward Tuning Reference’ value.
Th e PRF/DEF filters were designed specifically to address and emulate the characteristics of samples whose
pitch and dynamics have been transposed. For this reason, this musically adapted filter does not behave like
a traditional EQ, with one parameter effecting the next. Experimentation is encouraged. It might also be
helpful to use a Frequency Analysis Plug-in at first to get a feel for each filter parameter.
Fc – Determines the initial center frequency for the Q0 Quality factor.
Q0 – Simultaneously determines gain, Quality (filter width) and a center frequency offset relative
to the initial Fc setting.
Q0H – Th is high frequency quality factor has a fixed center frequency near 7.5 khz and is
especially helpful in de-emphasizing the harsh overtones of upwardly transposed samples.
V0 – Initially designed to compensate for any gain attenuation imposed by the filter, V0 can also
be used creatively to increase the dynamic range of an instrument, achieving softer pianissimos and
bolder fortes.
Designing Filter Profiles
When designing filter profiles, it is best to set ALL four filter parameters (Fc, Q0, Q0H, V0) for a single
interval set before moving on to the next interval set, i.e. once you select ‘Up Long’ you should finish
tweaking Fc, Q0, Q0H, and V0 before selecting the ‘Up Short’ interval.
For example, to adjust the ‘Up Short’ filter set parameters, first select the ‘Up Short’ interval set.
Now trigger a note and bend that note upward by three semitones to hear what the current filter settings
sound like. Next, adjust Fc, Q0, Q0H and V0 until the transposed note sounds as close as possible to the
non-transposed note. Th e goal is to adjust the ‘Up Short’ filter parameters until, for example, a note
transposed from C3 to D#3 sounds the same as a non-transposed triggered at D#3.
Note:
Once a parameter has been modified, it is necessary to first hit ‘Apply’, then retrigger the note before
the new settings will be audible.
Before Adjusting the ‘Up Long’ and ‘Down Long’ filter sets, make sure that you specify the Upward and
Downward Tuning References on the main ‘Portamento Reshaping Filter’ Tab. Th e ‘Long’ filter sets
correspond directly to the number of semitones specified by these tuning references. For instance, if you set
the upward tuning reference to 12 semitones, the exact ‘Up Long’ filter settings will be applied to samples
that have been transposed upward by 12 semitones. Samples transposed upward to less than 12 semitones
(between 4 and 11 semitones) will be filtered by a composite of the ‘Up Short’ and ‘Up Long’ filter set
parameters (morphed).
Please see Chapter 9 on editing parameters in the Region Window for more specific details on adjusting region
specific values.