Hi everyone,
We've just released a new firmware update for the CM Storm Spawn that is specifically made to target issues reported with VOIP and CPU latency. Based on the feedback and testing, we were able to replicate the problem and now fixed it with the latest firmware update.
Please note: As with all Firmware updates, you should only update if you are experiencing any problems we have addressed. For those that have this issue, please let me know if it fixes your specific issue.
Direct Link: http://coolermaster-usa.com/download.php?action=ViewDownload&id=328
This is the result of using this new firmware and testing with VOIP active.

We've just released a new firmware update for the CM Storm Spawn that is specifically made to target issues reported with VOIP and CPU latency. Based on the feedback and testing, we were able to replicate the problem and now fixed it with the latest firmware update.
Please note: As with all Firmware updates, you should only update if you are experiencing any problems we have addressed. For those that have this issue, please let me know if it fixes your specific issue.
Direct Link: http://coolermaster-usa.com/download.php?action=ViewDownload&id=328
This is the result of using this new firmware and testing with VOIP active.