Make sure you at least have used the same bitrate, compression mode (VBR or CBR), frequency (44khz vs 48khz, or others) and channel type (stereo or mono) as the stock file. I remember SH4 does not support every available format. This is also true for WAV. You have to imagine SH4 is allocating buffers for sounds, probably partially hardcoded for its size, and as such if you exceed that buffer (for instance when now using a higher bitrate) you will overflow it and CTD. What webster says is also true, if files are longer or shorter, similar problems might occur. Some workarounds used by people were to add silence (if an audio track was cut shorter) to it's original length.
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