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mIRC needs 'Enable sounds' option checked (ALT+O/Sounds).
As stated previously, this has already been confirmed.
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Moreover, you need Microsoft PCM Converter codec (installed as default in Windows) - not LAME MP3 or something else - to use /splay for MP3, WMV, OGG...
This I was unaware of, as I rarely use mIRC for playing sounds. Thus this is something I will look into as being the possible source of the problem.

Thanks for your assistance.