We know that the stock micromax comes with lower volume output. To overcome the same on the rooted phone install xposed installer ~ Gravity box. Goto to mosc. Tweaks and select audio then increase the volume within the max limit (e.g. headset volume to 150). Later reboot the phone for better performance!! I hope this help us to listen our favourite song with loud volume and fullest enjoyment.
Cheers!
Vinay's IT Press 