Landwaver

Gamepad controls (recommended)
A B X Y > hold to edit each of the 4 levels of the oscillator

while editing a layer :

left stick > modify amplitude and frequency
directional pad > shift phase
L1 R1 > change wave shape

Keyboard controls
1 2 3 4 > hold to edit each of the 4 levels of the oscillator

while editing a layer :

Z S > modify amplitude
Q/A D > modify frequency
O L > change wave shape
K M/; > shift phase