Very simple. Not need the manual. It adjusts the input level of 5dB steps up to 70Db.
The sound is superb. Di is convenient to return guitars and basses directly. For me the DI is also more effective in the bass my Godin Multiac; to resume this one I prefer to go through microphones outdoors.
For two years.
I have a summit 2Ba-221 that I always use elsewhere .. well designed machine, no complaints, except for the fact of feeling the need to buy now high-end converters.
This is great but expensive.
Yes, I do it again this choice without problem