Bass.

Step 2: Turn PRESETS two clicks to the left, to ACID BASS.

The first click opens the browser. Each click plays the sound it lands on: ACID BASS is the acid squelch.

If it doesn't work: The browser closes after 8 seconds untouched. Turn PRESETS again to reopen it.

Step 3: Press SEL to take it.

SEL gives the sound to the track. HOME would have left FAT BASS where it was.

Step 4: Press SEQ.

SEQ switches the track's pattern on and opens its grid: steps across, the notes of A minor down.

Step 5: Press OCT- once.

The keys play an octave lower, where a bass lives: the grid's rows now read A2. The octave is the track's own.

Step 6: Type steps 1 to 8: each key writes a step.

Each key writes its note and moves on. A rest: hold SEQ and press any key.

Tip: A wrong note? Turn ALGORITHM back to it and press the right key.

Step 7: Type steps 9 to 16.

The line jumps up to E and G and lands back on A. That movement is the acid.

Step 8: Hold HOME and press key 2: two bars.

SHIFT + key 2 (G3) makes the pattern 2 bars. Bar 1 is copied into bar 2, ready to answer.

Tip: The header reads BAR 1 OF 2 once it worked. A copy you do not want? SHIFT + REC takes it back.

Step 9: Hold SEL, press OCT+, then key 10: step 26.

Held, SEL + OCT picks the bar and SEL + a key the step in it. Bar 2 changes from here.

Step 10: Type steps 26 to 31 over the copy.

Bar 2 answers: up through D and E to G, then down to C, back toward A.

Step 11: Press PLAY.

Drums and bass together. The bass loops every 2 bars, the drums every bar.

Step 12: Tap HOME and watch TRACKS.

Each track loops over its own length. Here the drums go round twice for every pass of the bass.

Step 13: Press PLAY to stop.

Two tracks down. Next come the chords.