Ditto has a 6-position FX switch that includes a ONCE option.
Really annoying that they haven’t managed to post a manual yet. There are 4 DIP switches. The catalog page has a description but I could use a little more info.
I set the first DIP switch to make it behave like the RC-30 in going record-> overdub-> play (the factory setting is record-> play-> overdub) - at least while I’m getting used to it and exploring its power.