Hi Thomas,
On Fri, 12 Mar 2010, Thomas Orgis wrote:
>> If you want to do a mapping inside of hydrogen, do it in midi_input.cpp.
>> Look at line 143 for the takes CC message handling. You may also want to
>> introduce a std::map or something for the NoteOn messages in
>> MidiInput::handleNoteOnMessage.
>
> That looks really useful... I think what I want is just a
> bit of added magic on line 201:
>
> int nInstrument = nNote - 36;
>
> depending on some lookup table in MidiInput, that is
> modified when CC messages come in, or I really just skip
> the CC part and set the mapping on note on/off of the
> hihat pedal. As long as there is no real hihat controller
> with more levels of openness, this mode would be more
> useful, even.
>
> I don't see much difficulty in adding this in the source,
> perhaps adding config file settings, too ... it might be
[snip]
If I understand this correctly... then a simple way to
implement this in Hydrogen would be:
* Implement some variable that maintains state
(e.g. an enum with OPEN and CLOSED). We'll
call it pedal_state. The variable needs to
be accessible to the MidiInput class.
* The MidiInput class would need to handle
CC#4, changing pedal_state state as it gets
MIDI data.
* When Hydrogen gets a MIDI Note On for Notes
42 (Closed Hi-Hat), or 46 (Open Hi-Hat), it
needs to re-direct them both based on the
current value of pedal_state. (Redirect
to #42 if CLOSED, #46 if OPEN.)
* This will ONLY work for a GM-compliant drum
kit. For anything else, this is just wrong
or you'll need to find a way to configure it.
Hydrogen currently does not have an sort of
metadata to determine if a kit is GM.
An experimental idea:
* When the state changes from OPEN to CLOSED,
generate a note #44 with a low velocity
to mimic the sound of the cymbols coming
together.
Note: The standard CC#4 is a generic "foot pedal"
controller. That is, it's intended to be used for generic
expression pedals. This controller is not dedicated for
hi-hats... so make sure that you can disable this
functionality.
Thanks,
Gabriel
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