beats per measure can be either of the following:

• empty or 0 (no groups)
• one or more numbers separated by + e.g. 4, 2+3, 3+2+2

space

start/stop

up

increment tempo by 1 (when input not focused)

down

decrement tempo by 1 (when input not focused)

left

decrement tempo by 10 (when input not focused)

right

increment tempo by 10 (when input not focused)

n

halve tempo

m

double tempo

j

third tempo

k

triple tempo

.

tap

b

focus beats per measure

t

focus tempo

u

start/stop tuner