Emulator recording is not preferred for accuracy though, because there still isn't even one emulator (or plugin) in existence that successfully replicates the PSX reverb 1:1. The closest one is the open source edition of Pete's DSound plugin, but even that sounds very flat when compared to the real hardware.
If I remember correct, PCSX2 devs have noted this and are planning to implement hardware-accurate reverb, but that one can't even run a PS1 game past the main menu yet, so that won't be an option for a while still.