vgmrips

Excellent soundtrack!

But for some reason, it totally stutters on in_vgm and foo_input_vgm with the Nuked OPM core (Mame core works correctly).
Strangely enough, VGMPlay with the Nuked core doesn't have any issue.

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VGM packs by Kaminari

From what I remember, GORRY is Hiroaki Goto and Yu-You is likely Hideya Nagata.

Yep, same for me.

I recommend you to use the latest version of in_vgm. I'm currently using in_vgm v0.50.1 and the latest version of MDPlayer without any issues.

On my i3-8145U CPU at 2.3GHz emulating single YM2151 takes about 90% of a CPU core, and 2 of them are not possible to run in a single thread without stuttering, which is likely to be issue here. If I overclock CPU to 3.9GHz it does work most of the time with only occasional stutter.

Nuked OPM is known to be very, very demanding.
The 64-bit version of VGMPlay seems to perform slightly better than the 32-bit version for some reason. The plugins are only available as a 32-bit version, so maybe that is where the difference comes from.

It is well known that intel's low voltage CPUs perform poorly, especially low voltage i3 processors. So for performance, I only buy standard i7 computers. Especially using MDPlayer, this software takes up a lot of CPU.

On my Ryzen 2600X at 4 GHz, the dual YM2151 uses 1% of CPU with the Mame core and 6% with the Nuked core.

Considering VGMPlay has no problem playing those files, I tend to agree that the 32-bit plugins might be the culprits. Unfortunately I can't try the 64-bit version of foo_input_vgm since I'm still using the 32-bit version of Foobar 2.0 (for compatibility reasons).

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VGM packs by Kaminari

Keep in mind that, for a 12-thread CPU, "100% usage for a single-threaded process" means "8.3% total usage" in the task manager. "6% total" could mean between 72 and 83% for a single thread, so there isn't much leeway left.

In a vgm2wav test I just made, 32-bit VGMPlay was about 20% slower than 64-bit VGMPlay.

Pardon for the off-topic, but actually they can perform rather well by abusing turbo-boost technology: you can undervolt by about 0.2v and program turbo-boost cooldown of a few hours. This effectively oversteps built-in package overheat limit (which tends to be set to something like 60°C) and lets whole CPU run at turboboost frequency. Your mileage may wary but my laptop stabilizes at about 83°C and this is just fine when you are using it like this for a few hours at most.
More info here: https://github.com/erpalma/throttled

I'm a bit bothered by the fact that this pack is listed as a PC-88 soundtrack.

The way I understand it, those tunes have been composed on Sharp X1 + sound expansion board. But since that hardware is not specifically emulated by Mame, the music was logged via an equivalent solution for the PC-88 (JMB-X1 board). That doesn't make it a PC-88 soundtrack, does it? Shouldn't this pack be listed as X1, whichever method was used to record it?

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VGM packs by Kaminari