updated modulation part (still needs limits and channel change)

README.MD

@@ -3,17 +3,16 @@ Features:
 - Master BPM
 - Separate divider or multiplier per chennel (from /32 to x24)
 - Per-channel random pulse skip (currently only 50/50 chance)
-- 2 inputs for external modulation (currently only 1, hardcoded to channel 6)
+- 2 inputs for external modulation
 
 TODO:
 - per-channel modulation settings
 - different chance options for random
-- External clock
 - Save state to EEPROM when stopped
+- design PCB
+- external clock
 - swing
-- Switch to U8G2 for screen
 - settings (input mode, pulse length)
-- Design PCB
 
 Timer library available here
 https://github.com/PaulStoffregen/FlexiTimer2