Sorry for my late answer but i was on holiday and then busy at work.

I do not use an mixer i have two speed control units, "Graupner micro speed 10" each is controlled by one lever on my transmiter it is quiet tricky because the speed controller aren't set up to the same rpm this means you have allways to keep an eye to your boat but it is great fun especially if some one else is sailing my model.

regards Hans

This posting may be a bit late. Ive found that the Action p94 mixer
is ideal for twin motors.It can be set up to give one motor foreward
the other in reverse so enabling the boat to spin.Should have said
that its two Escs and a mixer all in one. John.

Hello and Welcome Eddy- I am a new member here as well!!