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Thanks for your question.
You can use the post_mime_type=audio parameter to limit the cloud to audio files. Be sure to include the minimum=1 parameter to eliminate terms with no audio file assignments. Try something like:
[mla_tag_cloud taxonomy=attachment_category minimum=1 post_mime_type=audio]I am marking this topic resolved, but please update it if you have problems or further questions regarding the above suggestion. Thanks for your interest in the plugin.