bharathchandranaik Sapavat

Hell everyone I am new to cakewalk, I have a recording of guitar and I don't know it's tempo so I created a tempo mapping by dragging it to the timeline. The problem is, it sounds better in cakewalk, when played along with metronome. but when exported it out it's the same thing as the original. It was a long recording and I don't wanna do it manually for days. Does anyone have any suggestions