grooves

a groove is the equivalent of repeating 0Fxx effects on each row to get a cycle of speeds. for example, a groove of "6 4 5 3" makes the first row 6 ticks long, the next row 4 ticks, then 5, 3, 6, 4, 5, 3...

groove

to set the song's groove:

open the "Speed" window.
click the "Speed" button so it becomes "Speeds" (effectively a groove of two speeds).
click again so it becomes "Groove".
enter a sequence of up to 16 speeds.

groove patterns

the "Grooves" window displays the list of groove patterns in the song.

the + button adds a new groove pattern; click in the groove pattern to edit it.
the × buttons remove them.

a single 09xx command will switch to the matching numbered groove pattern.

tempo

this is a non-exhaustive list of grooves and their equivalent tempo in BPM when using NTSC or PAL tick rates (60 or 50) and row highlight values of 4 and 16. for more accurate tempos, differing tick rates, or differing row highlight values, use this groove calculator (courtesy of Damian Yerrick).

BPM NTSC	BPM PAL	groove	BPM NTSC	BPM PAL	groove
100.00	83.33	9	168.75	140.63	6, 5, 5
102.86	85.71	9, 9, 9, 8	171.43	142.86	6, 5, 5, 5
103.85	86.54	9, 9, 8	175.61	146.34	6, 5, 5, 5, 5, 5, 5, 5
105.88	88.24	9, 8	180.00	150.00	5
108.00	90.00	9, 8, 8	184.62	153.85	5, 5, 5, 5, 5, 5, 5, 4
109.09	90.91	9, 8, 8, 8	189.47	157.89	5, 5, 5, 4
112.50	93.75	8	192.86	160.71	5, 5, 4
114.29	95.24	8, 8, 8, 8, 8, 8, 8, 7	194.59	162.16	6, 4, 5, 4, 5, 4, 5, 4
116.13	96.77	8, 8, 8, 7	200.00	166.67	5, 4
118.03	98.36	9, 7, 8, 7, 8, 7, 8, 7	205.71	171.43	5, 4, 5, 4, 5, 4, 4, 4
120.00	100.00	8, 7	207.69	173.08	5, 4, 4
122.03	101.69	8, 7, 8, 7, 8, 7, 7, 7	211.76	176.47	5, 4, 4, 4
124.14	103.45	8, 7, 7, 7	218.18	181.82	5, 4, 4, 4, 4, 4, 4, 4
126.32	105.26	8, 7, 7, 7, 7, 7, 7, 7	225.00	187.50	4
128.57	107.14	7	232.26	193.55	4, 4, 4, 4, 4, 4, 4, 3
130.91	109.09	7, 7, 7, 7, 7, 7, 7, 6	240.00	200.00	4, 4, 4, 3
133.33	111.11	7, 7, 7, 6	245.45	204.55	4, 4, 3
135.00	112.50	7, 7, 6	248.28	206.90	5, 3, 4, 3, 4, 3, 4, 3
135.85	113.21	8, 6, 7, 6, 7, 6, 7, 6	257.14	214.29	4, 3
138.46	115.38	7, 6	266.67	222.22	4, 3, 4, 3, 4, 3, 3, 3
141.18	117.65	7, 6, 7, 6, 7, 6, 6, 6	270.00	225.00	4, 3, 3
142.11	118.42	7, 6, 6	276.92	230.77	4, 3, 3, 3
144.00	120.00	7, 6, 6, 6	288.00	240.00	4, 3, 3, 3, 3, 3, 3, 3
146.94	122.45	7, 6, 6, 6, 6, 6, 6, 6	300.00	250.00	3
150.00	125.00	6	327.27	272.73	3, 3, 3, 2
153.19	127.66	6, 6, 6, 6, 6, 6, 6, 5	337.50	281.25	3, 3, 2
156.52	130.43	6, 6, 6, 5	360.00	300.00	3, 2
158.82	132.35	6, 6, 5	385.71	321.43	3, 2, 2
160.00	133.33	7, 5, 6, 5, 6, 5, 6, 5	400.00	333.33	3, 2, 2, 2
163.64	136.36	6, 5	450.00	375.00	2
167.44	139.53	6, 5, 6, 5, 6, 5, 5, 5	900.00	750.00	1