By the way, this build will fly 5 Min. on a 2 cell 2500mah battery.
The osulation you hear when moving the troller is the altitude hold trying to keep up, the esc’s are to slow or the timing needs to be adjusted, I think this bugs board need fast response ESC’s from high to low and I think the board works on PPM, not PMW.
If I knew what I know now about a Bugs, I would have never ever bought a KK.2.1.5 or a Naxa M Lite to build a quadcopter. Put this on a light frame and a gimbal and this all you need. for the price.

https://www.ebay.com/itm/TopSky-Q380-Quadcopter-Frame-Kits-High-Strength-Surpass-F330-for-Multicopter-FPV/262060144609?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D52935%26meid%3D24c2ee7adbae491daad01530ad919214%26pid%3D100005%26rk%3D5%26rkt%3D12%26sd%3D171874050552%26itm%3D262060144609&_trksid=p2047675.c100005.m1851

https://www.dx.com/p/mjxr-c-b2c-012-receiving-board-for-mjx-bugs-2-b2c-b2w-516741#.W5XZ9s5Ki00

https://www.dx.com/p/mjxr-c-b2c-008-gps-module-for-mjx-bugs-2-b2c-b2w-black-516870#.W5XaSM5Ki01

https://www.dx.com/p/mjxr-c-b2c-011-compass-module-for-mjx-bugs-2-b2c-b2w-black-516739#.W5XahM5Ki00

https://www.ebay.com/itm/4x-EMAX-BLHELI-30A-ESC-BEC-2A5V-Speed-Controller-for-FPV-RC-QAV250-Quadcopter/282198835623?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D52935%26meid%3D35077922e89448a8bc0842d7e36ef13c%26pid%3D100005%26rk%3D8%26rkt%3D12%26mehot%3Dag%26sd%3D182725844582%26itm%3D282198835623&_trksid=p2047675.c100005.m1851

https://www.ebay.com/itm/4Pcs-A2212-1000KV-Outrunner-Motor-13T-for-DIY-RC-Aircraft-Quadcopter-Drone-FPV/352142210060?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D52935%26meid%3D32cf0222967640b8b372c49f3bdc7964%26pid%3D100005%26rk%3D1%26rkt%3D12%26mehot%3Des%26sd%3D252812405210%26itm%3D352142210060&_trksid=p2047675.c100005.m1851