™BTD Pocket Synth
A tiny browser synth for quick ideas, playful sounds, and creative sparks.
Touch tip: Tap Turn Synth On, then tap/hold pads or keys. Turn on Arp for moving chord patterns. Key Lock helps beginners stay in key.
1. Turn Synth On First
Browsers need one tap or click before sound can play. Start low, turn up slowly, and tap Synth On/Off as needed.
2. Play Your Way
Use mouse or computer keyboard. Number keys 1–8 play pads. Letter keys play notes.
Use touch on iPad or phone. Tap and hold pads or keys. Turn on Arp for moving patterns.
3. Headphones Help
For the best sound, use headphones or speakers. Tiny phone speakers may hide the low end.
Audio
Off
Current Preset
Soft Piano
Output Safety
Limiter On
ArpeggiatorOff
Arp Rate1/8
Arp RangeAuto
Tempo100 BPM
Sound ControlsLive
Waveformtriangle
Cutoff1200 Hz
Resonance1.4
Attack0.55s
Release1.80s
Delay0.24
Volume0.50
Oct 0
iTonic1
ii°Diminished2
IIIMajor3
ivMinor4
vMinor5
VIMajor6
VIIMajor7
OctaveRoot8
Smart Pads rebuild from your selected key, so beginners get chords that fit.
C3
A
A
D
S
S
E
D
D
F
F
F
G
G
G
A
H
H
B
J
J
C4
K
K
D
L
L
E
;
;
F
G
A
B
C#
W
W
D#
E
E
F#
T
T
G#
Y
Y
A#
U
U
C#
O
O
D#
P
P
F#
G#
A#
Beginner Key Lock
On: only highlighted notes and unlocked pads will play.
Computer keyboard:
Pads use numbers. Letter keys only play highlighted notes when Key Lock is on.
12345678
AWSEDFTGYHUJK
Status: Ready. Choose a key, leave Key Lock On, then play pads, keys, or arps.
On iPad/phone: tap and hold pads or keys to play.