Predefined scales.
1/1 21/20 7/6 3/2 14/9 2/1
1-3-5-7 hexany, utonal stellated second degree (49/48) and 2/1 removed to fit eight buttons 1/1 25/24 7/6 5/4 35/24 3/2 5/3 7/4
1/1 37/32 21/16 49/32 7/4 2/1
1/1 9/8 151/128 3/2 25/16 2/1