In 3CX call queues the "Play Intro Prompt" feature mixes in the "Music on Hold" at a low volume so that the caller hears the hold music under the Intro Prompt. This is a nice feature but in some use cases it would be good if it could be disabled. Many customers actually want a ringing or "Progress Tone" rather than music in a queue and this does not sound good in the background the Intro Prompt. You can't even create wav files with silence at the beginning to use as the Music on Hold since the recording loops. (As an aside it would also be good if the Progress Tones all regions were included in the 3CX install).