Hi sir,
If your looking for a guaranteed fix without risk of damage to the POE switch I would encourage you to go with the option I recommended.
However it is possible to use just the ptz with the regular power supply and still have it connect to the ptz but you do run some element of risk.
Perhaps this article will help you troubleshoot the mic issues as well or at least rule out physical connection issues.
http://www.securitycameraking......ra-system/