Very cool...congrats!
My brother and I have vast memories of playing around with my Dad's TC-630 growing up...playing with the SOS echo, making our own "radio shows"...mix tapes...and not realizing we were documenting some much valued times and circumstances.
My favorite aspect of your 730 is the NORMAL/SPECIAL tape select. Maybe that would help some of my songs to sound...special. Hahah.
Nice looking machine!