Tried a search but I can't find this specific issue amid other engine sound posts.

 

I usually start no. 2 then no. 1, autostart procedure with both fuel switches in RUN detent, then start the engines in turn. No. 2 starts fine with no peculiar sounds. When starting 1 I hear an intermittent buzzer, sounds like flaps out-of-position or could be ignition cracker sound, not sure. Hardware throttle at idle during start. Buzzer stops when fuel flow starts and engine runs up.

 

Anyone experienced similiar? It's the 773 BTW.

No idea what it could be, which sound set are you using is it the 5.1 or stereo?

 

A but of advice, if you want to be a little more realistic, you set the start switches to start FIRST then check for oil pressure to rise then set the fuel control switch to run. The reason for this is the auto start monitors and aborts engine starts for most abnormal engine indications except for oil pressure. If the oil pressure doesn't start to rise during the start then the auto start won't abort the start and in the real world you would damage the engine after a couple minutes of running it.

Some airlines wait for oil pressure rise before switching the fuel on, others don't. Either way oil pressure must be monitored by the crew. But certainly start switch first before fuel switch. Not that that will affect the sound.

I'm using the stereo sound.

 

Tried start switch first then fuel switch. As predicted, the strange sound is still there.  Here's a quick and dirty recording I made starting engine 1. Start switch first, then fuel switch when oil pressure rises. The background sounds are very faint but the weird intermittent buzz is there, from 36 seconds.

 

Edit: just tested in the 772 and the strange sounds are not there. I only get the strange sounds in the 773.

Definitely a weird one I've never heard a sound issue like that before. Submit a support ticket.

Have you tried playing the sound files outside the sim to see if they are corrupted? Also if you have fs sound studio you can see the envelopes

PMDG support directed me to do a clean reinstall of the T7 (772, then SP1, then 773). That has cleared the sound problem. Still no idea what caused it though.