[LAU] [LAD] [LAA] Mamba - Virtual Midi keyboard for Jack Audio Connection Kit release 1.8

Hermann Meyer brummer- at web.de
Tue Jan 5 11:50:05 CET 2021

Am 24.11.20 um 11:40 schrieb David Kastrup:
> Hermann Meyer <brummer- at web.de> writes:
>> Mamba release v1.9 is out
>> Mamba is a Virtual MIDI keyboard with some extended, unique features.
>> This is a quick fix release as I've forgotten to implement jack MIDI
>> input forwarding to ALSA MIDI output.
> Stupid question: I see you implemented different national keyboard
> layouts that basically define a mapping from characters to physical key
> positions.  I think that raw X11 key events might actually encode key
> positions (or numbers based on a particular arrangement of keys) but
> maybe they are not easily available at the layer your key events arrive.
> But the actual question is a different one: have you considered offering
> a chromatic button accordion arrangement "on top" of that national
> remapping?
> Basically it would mean that a chromatic scale is encoded as
> zsexdrcftvgybhunjimko,lp.;[/'] for C system (with a qwerty keyboard,
> starting at C) and
> qazwsxedcrfvtgbyhnujmik,ol.p;/ for B system (again, starting at C).
> Finnish G system uses the same scale as C system apart from starting
> with C♯ rather than C in the first row.  I can provide images if
> necessary (there are some at
> <https://en.wikipedia.org/wiki/Chromatic_button_accordion>).
> Modern CBA keyboards tend to have 5 rows but the inner 2 rows are
> repeats for making transposition and chord fingerings easier and
> basically every player can get along without them at least when doing
> note entry.  So whether to offer more than 3 rows depends on whether
> there is an actual use for the numbers and function keys.
> The main advantage for CBA players of course is easier entry.  The main
> advantage for everyone else would be access to more notes at the same
> time.
I've now implemented the possibility to define 2 keys per note within
the Keymap Editor. That enable you to setup a  chromatic button
accordion arrangement for Mamba.

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