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). Sizes from
8-bass
children's models up to the full
120-bass
are in the dropdown.
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.
Diatonic
(melodeon) is
bisonoric
: each physical button on a real instrument plays a different note on the
push
than on the
pull
. We split that out into two keyboards side by side ā the green
PUSH
half on the left and the orange
PULL
half on the right. Only one half can sound at a time, just like a real bellows can only
push or pull (try it: hold a PUSH button and tap the PULL side ā nothing plays until you
release). The
C
1-row is the
Cajun
/ Hohner Pokerwork;
D/G
and
G/C
are the standard British / French folk 2-rows;
B/C
is the Irish trad layout where the rows are a semitone apart.
The
Register
switches engage different reed banks, just like a real accordion. The
right hand
(treble) side has the full 11-stop matrix:
L
= low (octave down, "Bassoon"),
M
= middle (concert pitch, "Clarinet"),
H
= high (octave up, "Piccolo"), plus combos like
LM
("Bandoneon"),
LH
("Organ"),
MH
("Violin") and
LMH
("Master") for fuller sounds. Stops with
two M dots
on the silver plate (
MM
"Musette",
LMM
,
MMH
,
LMMH
"Tutti") engage two M reeds detuned a few cents apart ā the characteristic
musette
beating you hear on French / Italian folk accordions. 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
). 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.
The
Octave
buttons (or
ā / ā
/
[ ]
) shift the whole instrument up or down an octave at a time ā every view follows along, so
you can match the pitch of whatever you're playing along with.
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.