after seeing the video of 16th Jan episode of SAREGAMAPA online, I feel the songs have been already recorded by debo and vinit and they were just moving lips in the show...
Coz it is impossible for a live show like this and many times I noticed that they both hadn't strained at all ON STAGE. The songs and music had been recorded already and just played on stage with they just holding the mike and moving lips!!!!!!!!!!!!!
Even for regular play back singers singing like this on stage is IMPOSSIBLE!!