Re: [iiwusynth-devel] NRPN System

[Josh Green]

On Sat, 2002-12-14 at 18:40, Peter Hanappe wrote:
> Hi all,
> 
> I implemented a first version of the NRPN system. The NRPN midi
> messages allow the control of the synthesis parameters, or generators,
> in real-time. To change a parameter the following suite of MIDI
> messages have to be sent:
> 
>    cc chan=0 ctrl=99 val=120                         = NRPN_MSB
>    cc chan=0 ctrl=98 val=<generator number>          = NRPN_LSB
>    cc chan=0 ctrl=38 val=<data LSB>                  = DATA_ENTRY_LSB
>    cc chan=0 ctrl=06 val=<data MSB>                  = DATA_ENTRY_MSB
> 
> For a list of generator numbers, see the 'iiwu_gen_type' in iiwusynth.h,
> or section 8.1.2 in the SoundFont specifications.
> 
> I added a new API function that is a little more to the point:
> 
>   int iiwu_synth_set_gen(iiwu_synth_t* synth, int chan, int gen, float value)
> 
> Note that the given value adds up to the value
> specified in the soundfont. For the useful value ranges, check section
> 8.1.2 in the specifications again. The synthesizer should clip the
> values internally to the allowed range. I also added 'iiwu_synth_get_gen'.
> 
> Cheers,
> Peter
> 

Sounds really cool :) I'm assuming that changing a generator in real
time does so for all voices on the designated MIDI channel? Also, how
did you go about selecting the NRPN value of 120? Cheers.
        Josh Green