The View menu picks one face of the instrument at
a time ā pick a Stradella variant for left-hand practice, or a
right-hand layout (piano / chromatic B / chromatic C) for melody.
Each one comes in a horizontal and a vertical
flavour.
Stradella columns run around the circle of fifths
with home markers every major 3rd ā
C / E / GāÆ (Aā) ā same spacing
as a real 120-bass instrument. Eastern 5-row drops the
diminished-7 row; Free bass swaps the chord rows for
three octaves of single chromatic notes (Russian bayan style).
Chromatic rows ascend by minor 3rds with adjacent
rows offset a semitone ā diagonals trace a chromatic scale.
B-system is standard on the bayan; C-system is
the Western chromatic mirror.
The Register switches engage different reed
banks, just like a real accordion. The right hand
(treble) side offers the full set: L = low (octave
down), M = middle (written pitch), H = high
(octave up), plus combos like LM, MH, and
LMH ("Master") for fuller sounds. The left hand
(Stradella) side has its own simpler pair: Tenor for a
single tonal reed, or Master for all bass reeds layered
together (loud and full). The strip swaps automatically when you
switch views, and each hand remembers its last setting.
On the Piano view, the computer keyboard plays
(Z X C V B N M / Q W E R T Y U) and
ā / ā shifts the octave. A real accordion keeps
a note ringing only while you press it, so there's no sustain ā
just hold the key. WebMIDI works on every view.
Bellows mode (phones only): when on, notes only
sound while you're moving your phone ā swing it left and right
like a real bellows. Hold a button still and the room goes
silent; rock the phone to "pump" air through it. Bigger swings
push more volume.