Good afternoon. I spoke with Ryan at American Music and Sound. He said there is a known issue with popping on inputs (which should be resolved in the next firmware update), but they weren’t aware of an issue with outputs. He suggested I downgrade to the 1.4 firmware and monitor to see if the issue is resolved. I am running the old firmware now and will update here if the issue replicates. Hopefully the upcoming firmware will resolve the issue (beta is available now.)
In regards to sync/clock, he said that is’t a factor in my case since the only I/O I am using is the built-in port for the DX-168. Clock is set to internal and never had issues prior to 1.5.
Thank you both for your input!