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Thanks for your question. I am a copyright and intellectual property solicitor in the UK with 35 years of experience in private practice and I hope that I can help you with your question today. Let me just read your question and I will either give you an initial answer or ask you for further information. I aim to respond to you as quickly as I can but sometimes I may want to take a little time to consider your question so as to give you the best answer I can.
I presume you are concerned about copyright infringement. You can have the various undertakings and disclaimers on your website and retain the power to remove anything that is an apparent breach of copyright. There is also software that can recognise sections of existing recordings and refuse to allow uploads of anything that it thinks may be a breach of copyright. I know soundcloud and some other sites use it.