Lagrange Point famicom cart remake

I want to make a famicom Lagrange Point , It's finished now.
But no VRC7 sound.

Are you using a VRC7, or a CPLD (with a YM2413)?

The VRC7's audio output is extremely quiet, and uses a separate amplifier. Additionally it requires a separate clock source.

I use a cpld, not VRC7.
Is it possible to use a YM2413+CPLD to full simulator a VRC7?

Sorta.

The YM2413 is the same electrical interface as the VRC7, but it sounds noticeably different. See the two audio recordings comparing the two sounds (left/right, each file is a different song) on our wiki.

On the other hand, if you just want in-tune bleep bloops, it's adequate. But if you just want in-tune bleep bloops you may be able to emulate just VRC7's ADSR acting on some square waves and fit that in a CPLD.

Thank you.
I will try to add a normal YM2413 to my cart first.

With the CPLD you may be able to do a lookup table to remap instruments. You won't be able to fully cover all cases, but certainly some of the YM2413 presets can be made closer than the ones they map to presently.

That said, it doesn't sound too bad with YM2413, just different.

I'm just a primer, could you show more details on here.