Just started using mk3 and the preview button is inferior to the mk2 IMO as I have to hold it down to preview a track. I found a custom mapping to fix this, but I'm already using another custom mapping. So, can you help me out as I'd like to either

1. combine my current custom mapping w/ this preview custom mapping to make one new tsi file. Is that possible?
2. If not, can someone help me manually change this myself within my custom mapping?