User's Manual

Program Edit Mode
The Function (FUN) Page
7-48
The Function (FUN) Page
FUN is short for function. e Forte SE’s four FUNs greatly extend the exibility of the
control sources. Each FUN accepts input from any two control sources, performs a selectable
function on the two input signals, and sends the result as its output, which can be assigned
like any other control source. Using the FUNs involves dening them on the FUN page,
then assigning one or more of them as control sources. e FUN page looks like this:
ere are three parameters for each FUN. Inputs a and b can be any control source from the
Control Source list. e control sources you want to combine are the ones you’ll assign as the
values for these parameters.
e Function parameter determines what mathematical function is applied to the two
inputs. When a FUN has been assigned as a control source, the Forte SE reads the values of
the two control sources dened as Inputs a and b. It then processes them according to the
setting for the Function parameter, and the resulting value is the FUN’s output.
The Amplitude Envelope (AMPENV) Page
Amplitude envelopes have three sections: attack, decay, and release. e attack section
determines how long each note takes to reach its assigned amplitude level after you trigger a
Note On event. e decay section determines how quickly and how much a sustained sound
fades before a Note O is triggered. e release section determines how quickly a sound
fades to silence after a Note O is triggered.
Press the AMPENV soft button to reach the Amplitude Envelope page. For many programs,
it will look like the diagram below, which tells you that the amplitude envelope for the
current layer is the sample’s default “natural” envelope. Many factory ROM programs use the
natural envelope, which is custom designed for each sample and waveform during its original
development process. A natural envelope usually contains more detail than a user envelope,
and generally make samples of acoustic instruments sound more realistic.