Neo Geo （MVS） 合卡（1201, 138, 161 ）的音频问题修复
https://www.youtube.com/watch?v=jwHHIpLcjdE
一个长视频，涵盖了让PCM音频在MVS合卡上正常工作所需的模块。
视频作者（GadgetUK164）已经成功修复了120、138、161合卡中遇到的音频问题，受影响最大的一些游戏包括: Pulstar（120合1、161合1），Metal Slug，Blazing Star，Rage Dragons，Strikers 1945plus，Neo Turf Masters，KoF（部分一些）以及许多微小的故障。
Tested on 5 different multicarts and all 5 are perfect now. I am amazed at how good these carts sound after doing the mods. On the 120 in 1, C3 and C4 on the PRG (top) board need the 47pF bypass caps - those fix SDRMPX and SDPMPX (PCM issues). On the 'new' 161 in 1 board, C5 and C6 are positions for the 2 x 47pF caps, so you don't need to scratch traces to add the PCM fix caps on that newer 161 in 1.
One thing to note, I am not 100% sure whether 47pF is the ideal size for those 2 capacitors. On my 138 in 1 I get no sound issues at all with 47pF capacitors, but I recently played all the way through Pulstar on the 161 in 1 and a couple of times the sound did glitch, but hardly at all and very infrequently. This makes me wonder if 47pF might need changing to 57pF or 37pF etc. When I get more time I will retest with a slightly different size and report back.
Very hard to get it to glitch at all when using 47pF caps. I played on the 161 in 1 all weekend and never had a single issue. I think the ambient temperature and humidity is a factor also.
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