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diff --git a/README.md b/README.md
index 6450ef9..b7191a3 100644
--- a/README.md
+++ b/README.md
@@ -81,6 +81,21 @@ npm install
 npm start
 ```
 
+## Notes
+
+- `0x92 & 0xf0 = 144`, Ch3 noteOn
+- `0x80 & 0xf0 = 128`, Ch1 noteOff
+
+```
+function frequencyFromNoteNumber(note) {
+    return 440 * Math.pow(2, (note - 69) / 12);
+}
+```
+
+- Note values are on a range from 0–127, lowest to highest. For example, the lowest note on an 88-key piano has a value of 21, and the highest note is 108. A “middle C” is 60.
+- Velocity values are also given on a range from 0–127 (softest to loudest). The softest possible “note on” velocity is 1.
+
+
 ## TODO
 
 The idea is to build a synth/mini sequencer, here's some tasks I need to tackle before then.