Noise channel can glitch out when getting on a bike

[ariscop]

This can be triggered somewhat reliably in violet city with the bike on select. hit select during the group two kicks, after the first snare

Music_VioletCity_Ch4:
	toggle_noise 3
	drum_speed 12
	drum_note 4, 2
	drum_note 3, 2
	drum_note 4, 1 < hit select here
	drum_note 4, 1
	drum_note 3, 2

Whatever noise note was playing will continue into the bicycle music, the snare for example can be heard somewhat easily, but is most apparent with Kick1 as its first note has a flat volume envelope, and continues to play until another note replaces it

Kick1:
	noise_note 32, 8, 8, 107 ; initial volume 8, increasing, 0 steps
	noise_note 32, 7, 1, 0
	sound_ret

Vanilla crystal avoids this issue by playing MUSIC_NONE for one frame before starting the bike music

The following also works around the issue but i've yet to find the root cause

Music_Bicycle_Ch4:
-       toggle_noise 0
        drum_speed 12
        rest 16
+       toggle_noise 0
        rest 16
 Music_Bicycle_branch_ee34b:
        rest 2

[ariscop]

Still not entirely clear what happens but setting NOTE_REST (16afa85 ) seems to make it behave

With that set, UpdateChannels actually makes it to .ch4_rest and clears the currently playing note, otherwise it jumps to .ch4_noise_sampling and writes garbage to the sound regs instead