dual-tuner usb drive

#1
hi to all !
i have a Hauppauge dual-tuner dtt-t2 usb pen.

when i record manually is all ok.
i can record 2 channels at the same time or also 3-4 and more,
depending if they are packing in the same mux.

i have problems only when i want record by scheduler.
before i had a single tuner, and i don't had problems, because
i could record (for example) rai1 from 14.00 to 16.00 and after
canale5 16.30-19.00, because i had inside the scheduler the
change channel.

now with 2 tuners, i have some problems to record channels
when they have similar times of transmission.
how i can tell to the scheduler that i want record 1 channel from
first tuner and record another channel from the second tuner ???

thank very much.