Tascam Porta02 MkII - I had one of these but I never used it to record or playback tapes in my setup. Different models of 4 track I've got I feel do those things better, because of speed controls and 4-channel track mixers (verses this one just having two) and switches in place of knobs for channel selecting.
If I recall though this thing was sweet to just have in an effects chain with all the levels blown the fuck out. Taking little toy ass mixers and maxing all the gain (volume max, bass max, mid max, high max, master max, trim max etc). makes for some of my favorite overdrive/distortion you can get. Just plug in an input as if you're recording it, then output sound through the mains or the phones. You might have to hit record with a tape in there in order to monitor the sound live, by the way.
Boss DD-3 has the hold feature , it's their first delay pedal that did. In my opinion that's the best loop station you can get & all you're ever gonna need. I've got a DD-9 I think - it's whichever one does stereo delay. I never use stereo delay, rarely use any delay settings except hold.
Great job getting a Rat as well, you're gonna do great.
Casio Keyboard - this being cool really depends on which one it is. If you've got an SK-01 you hit the jackpot, same goes with any of the sampling ones that allow input. Never myself owned one of the Line 6 pods but they're multi-fx units, right? Because even if you've got a tonebank or something you could run it through that thing and fuck up the sound a bunch.
