Update readme.

Author: Archie3d

README.md

@@ -25,8 +25,9 @@ The convolution reverb uses impulse responses from the [Open AIR](https://www.op
 ## MIDI Control
 Sequencer steps are controlled via the program change messages sent on the control MIDI channel (program `0 `corresponds to the first step of the sequencer, `1` - to the second and so on).
 > In a DAW you may use `Program` parameter to control the sequencer steps.
+> Another way to control the sequencer is via key switches (MIDI notes). The default configuration uses keys `22` and `23` to control the sequencer.
 
-MIDI controllers (CCs):
+### CCs:
 - `CC 1` modulation wheel enables/disables tremulant
 - `CC 7` controls the global volume (on the control MIDI channel) and the volume of each division which has `swell` config flag enabled (on the swell MIDI channel)
 - `CC 91` controls the reverb output level