(please excuse my poor english

I want to fly a Blade CP an some 450-helis (all with bell/hiller-heads) with my Graupner MX12, GR 12 as receiver and spirit 2 not as flybarless-controller but as stabilisation unit.

On channels ch1 to ch3 i connect the servos for rotorhead, on ch4 the servo (or, on Blade CP, the second esc) for the tail rotor.

But : what to do with the main esc for the rotor ?

Without spirit, i mixed channel 1 (left up/down) of my mx12 for two outputs : main esc and pitch. the first 25% accelerated rotor-motor till endspeed, then pitch began. In middle position, the heli hoovered.

I read in the manual, the esc should be connected on AUX1.
Ok, but how to control it ??
How to mix the wished behaviour ??

I can find nothing in the manuals and here in forum ...

Any idea would shurely be very helpful ! thanks a lot !