diff --git a/README.md b/README.md
index 2d5ee98..9966d9f 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,15 @@
-# Models
+# Radio
+
+All models are for radiomaster boxer. It has the following layout:
+
+Top front left  : SA(2pos) SB(3pos) S1(dial)
+Top front right : S2(dial) SC(3pos) SD(2pos)
+Top right       : SE(toggle button 2pos)
+Top left        : SF(toggle momentary 2pos)
+
+Lower middle    : 6pos buttons 
+
+# Model List
 
 00. USB Simulator
 01. Blade Nano S3
@@ -19,3 +30,47 @@
 16. Bench test with extra ELRS receiver
 17. Squid Stick Simulator (TX Rates)
 18. Skynetic Dragonfly (RadioLink Byme-A Gyro)
+19. Ranger 600 (stock electronics with gyro, ETR no A)
+
+# Control Assignment
+
+This is evolving, current strategy on new models and gradually updating old:
+
+- Arming: SD up is armed/throttle active
+  Note: this is backwards from how FCs usually do it (since up = lowest PWM value
+  = default = disarmed). I like the feel of flicking down to disarm.
+
+- Reverse thrust: SA up for forward and down for reverse.
+
+- Flight modes: I usually use the 6pos, sometimes SB for simpler models.
+  First is Stabalize/Angle, then Rate/Acro, then Manual, or
+  for spektrum Beginner/Intermediate/Advanced (so AS3X is third)
+
+- Rates: SC, up is high down is low OR down is variable using S1/S2 for weight and expo
+  on custom curves
+
+- Trainer: varies, still experimenting. On models with <6 modes, I used high modes
+  for stabilize + trainer active with different levels of trainer input, e.g. A only,
+  AER only, all of AETR.
+
+- Flaps: SB, up is flaps up
+
+- Panic: SF, override flight mode to stabalize while pressed (or activate special
+  channels on some spektrum RX)
+
+- Return to home (iNav only): SE toggle button
+
+# Trim hacks
+
+I don't use throttle trim, so I turn it off in all flight modes and then can
+use it as a button. Logical switches based on timing with a 1 second beep when
+held so you know where it's at can be used to turn it into many switches.
+Useful for less frequently used functions like resetting timers. See the T-28
+and Ranger 600 for examples of this.
+
+# Trainer
+
+See T-28 and Ranger 600 for complex example. Stick take back, rates and trims
+on inputs that affect both instructor and trainer. Playing around with
+different return to student controls, switching to FM1 and back to FM3 works
+for now.