Dictaphone: How to automatically activate voice recording

Imagine the following situation: In the car there is sometimes an urgent need to remember something. While driving you cannot write nor can you unlock and write to your device.

Help comes in with a shake macro in MacroDroid. The macro shall start after a shake and lets you record what you want to say. You can listen what it was at home or anywhere else.

Step-by-step guide
Activate MacroDroid and activate your macro, that's it.
 * Install MacroDroid
 * Make MacroDroid active on locked device (uses more power, but is absolutely necessary as you cannot watch your phone while driving)
 * Create new macro
 * Trigger shake device
 * Action - Vibrate (so you will notice that the magic works)
 * Action - Wait before next action 10 seconds (or else the buzz will be recorded)
 * Action - Record during 30 seconds

PS The torch on is to prevent recording unaware people, a warning.