linuxaudio.org

On Mon, Mar 12, 2012 at 01:06:12AM +0100, Julien Claassen wrote:
>   Ah, anaother short question: What's the octave port for? If csound

quoted text
> sorts them all correctly, I heard something like a filter effect.

>   and another small conundrum, which I've been pondering: There's is the

> audio port frequency, to which I can send, whatever I like - so it seems

> - and nothing changes, but it responds to the tuning control port.

If you ask those questions that strongly susggests that Csound

(or your Csound code) is not handling this plugin correctly.
"Frequency" is an audio rate port that would normally receive

the frequency 'control voltage' from the keyboard. This is an

exponential control: +/- 1 --> one octave up or down. If you

send it (midi_note_number - 60) / 12 as an *audio rate* signal

it will do the right thing.
"Octave" and "Tune" are control rate ports normally linked

to GUI controls. They are the 'manual' frequency controls,

"Octave" in steps of an octave (it expects integer input),

and "Tune" with a range of one octave. In Csound you don't

need them as you can have the same result by adding the same

values to "Frequency".
Finally there are three modulation inputs (audio rate) and

their corresponding gain controls (control rate):
"Exp FM"   "Exp FM gain"     e.g from an ADSR

"Lin FM"   "Lin FM gain"     e.g. for vibrato

"Mod"      "Form mod"        waveform modulation     
The latter two have bad names, they should have been

"Form mod" and "Form mod gain" to be consistent with

the FM controls.
If you set "Exp FM gain" to 1.0, then "Exp FM" has the

same effect as "Frequency".
Again, this plugin is meant for use in AMS. A csound oscillator

normally has just a single frequency control and non of the FM

related ones (they are replaced by code).
Ciao,
--

FA
Vor uns liegt ein weites Tal, die Sonne scheint - ein Glitzerstrahl.
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