Controllers shown with key letters in ncurses display:

#  controller:	    letter:	implemented?:

 2 KEYPRESSURE		K	yes [MIDI event]
64 SUSTAIN		S	yes
65 PORTAMENTO		P	yes
66 SOSTENUTO		S	yes
 5 CHANNEL PRESSURE	p	yes [MIDI event]
 2 BREATH		B	no
 4 FOOT			F	no
69 HOLD2		H	yes (treated like sustain)
92 TREMOLO		T	yes
94 CELESTE		c	yes (for GS)
94 VARIATION SEND	V	yes (for XG)
95 PHASER		p	sort of
91 REVERBERATION	R	yes
93 CHORUSDEPTH		C	yes
71 HARMONICCONTENT	h	yes (for values > 64)
72 RELEASETIME		r	yes
73 ATTACKTIME		a	yes
100DECAYTIME		d	yes [NRPN]
 8 VIBRATO RATE		v	yes [NRPN]
 9 VIBRATO DEPTH	V	yes (shown in "X" column) [NRPN]
10 VIBRATO DELAY	d	yes [NRPN]
74 BRIGHTNESS		b	yes
17 DRYLEVEL		D	yes (for XG) [SYSEX]