found this on the net about the footswith
A TC Electronic ‘Switch 3’ footswitch can be added for even more control. TonePrint effects can be punched in and out and the amp can be muted. Furthermore, even though the TonePrint knob controls one effect at a time, the previously loaded effect is stored in the internal circuit and with the third switch this effect can be punched in and out as well, which in reality gives BH250 a dual effect section capable of combining any 2 of the 6 effect types available.