Glad you are enjoying it, TM...
I presume you have already found Roland-arranger.com which has a large Tips and Tricks section, many articles on gigging operation, and just a trove of handy suggestions on how to get the most from your ancient relic (be prepared to be the butt of many members' jokes here, as unfamiliar with G70's as most are
)..?
If you have any specific questions on Roland operation, please post them there, as there are MANY knowledgeable members there that don't post here. Usually, SOMEONE can come up with the answer to most problems.
Glad you found one in good condition at an affordable price. Enjoy.