44,1 kHz sample rate is commenly used for audio CD. 48 kHz is commenly used for audio in video.
I do not know a way to set the sample frequency, other than 48 kHz in PD.
Rendering with a higher sample frequency than the original sample frequency doesn't have advantages or disadvantages to the quality. Recware: DJI Osmo Pocket, GoproHero7Black, PanasonicFZ300/HCX909, Sony PXW-X160.
Software: Vegaspro365+Vegasaur/PowerDirector365
Hardware: i910900k,32GB,GTX2080s, 1920x1200 display
Playware: Samsung Qled QE65Q6FN, Philips 55PFL7108

Quote Olá!
Estou tentando exportar um arquivo mp4 H264/avc.
Funciona muito bem, mas o áudio está em 48khz?
Não é possível alterá-lo para 44,1 khz?
O áudio com o qual estou trabalhando no projeto é 44.1, mas sai AAC em 48khz?

It is common to use 44khz audio the video will convert to 48khz which is the standard for videos, I think it started with DVD-video.
This should not change the audio quality.
My edits that I add music from CD or MP3 will happen without problems, for the video and audio, I just set the bitrate using a high value it won't improve so I use the same as the original audio, usually 128kbps.

Thanks for your answers but no solution?
The video is made for streaming with ultra low latency that's the reason for 44.1. That's what's recomended.
Strange you can't change settings yourself, hmm
Thanks anyway!
I can always convert the file but I shouldn't need to do that, I think

You can easily change the audio settings on any produce profile, but CD 44.1kHz isn't an available option.

Depending on which Windows version you have, you might be able to choose from AAC, Dolby Digital or LPCM. Here are the available AAC compression rates with the default shown in blue:

It should be there since AudioDirector has it. ------------------------------------------------------------------------------------------------
PowerDirector 365