Great for building chops
My main intent for this unit was as a tool for the woodshed, for which it has worked great! It's helped me "clarify" difficult bass lines that have bothered me for years by allowing me to slow them down and pick through them. I also used it to record (via the line in) keyboards parts, sequenced drums, etc., so I can jam and practice improvising to chord progressions of my choosing. Want to improvise in a different key? Just shift the pitch of your recording or mp3.
It's also handy for quick recording of A/B comparisons, so you can play them back and concentrate on listening. For example, I just bought an expensive instrument cable, but after recording numerous styles of riffs on my new an old cables, I realized the old one sounded better, and returned the new one. (I was unable to notice these subtle differences when trying to do a live A/B comparison).
The drum loops are decent for jamming. Nothing I would try to compose with though.
The onboard effects can be handy, but noisey sometimes.
I found the bass/guitar "cancel function" confusing an ineffective.
The playback looping functions are very handy and easy to use!
The recording level of the line in is not adjustable. (Automatic)
It's annoying that the line in jack is only 1/8"
It bugs me to have to make an mp3 copy of my mp4 iTunes tracks so the GT-R1 can play them back.
Note: I have not yet tried recording with the external mics, so I cannot comment on that aspect of thr GT-R1.
Great service and fast delivery from Sweetwater as usual.