Watch at about the 27 minute mark, when he switches on the pack. There’s a definite hum from the pack as the blue bar graph starts running, before anyone switches on the wand. I have the wand, and the sound at that point isn’t any of the sounds the wand makes. I don’t think it’s just the vibrator motor. There’s also a moment towards the beginning of the video when he disconnects a cable ( to start removing the cyclotron cover) and he mentions that the final pack will give a ‘warning’ siren as that happens.The Spengler wand does in fact make the activate sound. Its the only sound that you can hear, other than the sound that plays when you pop the barrel out. The sound also doesn't play when he turns the pack on with the pack switch, it plays when the guy flips the switches on the wand. The pack is on with the motor running for about 3 seconds before you even hear the activate sound.
I'm confident the sounds heard in the video are coming from the wand and not the pack. The only sound you can hear from the pack, is the whining of the motor inside. I hope that is not on the final product lol.
Also, if the pack has a switch inside the cyclotron to swap between Afterlife and ‘84 sounds, and speaker holes in the top, it must have its own onboard sound.
It is difficult to tell exactly, though. I’m pretty sure there’ll be more videos between now and spring ‘23 which will make things clearer!