I made another thread regarding this but thought I should put this information here too.

For those not using isboxer and are looking for a method to switch between the two macros on one key, you can use actionbar switching ie.

/changeactionbar 2 (add to end of dps)
/changeactionbar 1 (add to end of proc)

Setup actionbar 1 and 2 the same except for the dps and proc macros, then it will switch everytime you press the macro - even if it fails because a spell isn't ready.