How to modify 3 band pass preamp board. Bass treble board ki modification kaise kare!

3 band pass preamp board ki gain increase ya decrease kaise kare woh yeh wala video pura dekhenge toh clear ho jayega ☺️ Agar yeh wala video informative laga hai to please like kijiye ta ki youtube isko boost kar paye 😃 agar naye hai to subscribe kar dena 🥺 #audiotroops #basstrebleboard #3bppreampm #modification #electronics #hiquality