internal sampling rate

[Harry Mudd]

hi folks
I discovered a slighly audio quality loss when using VM with other sampling rates than 48kHz.
Is there a chance to see an update which will gain constant audio quality at 44k1 cause I record all my stuff in this SR.
The quality loss is not dramatic but with high frequency stuff there is some aliasing audible.

[Harry Mudd]

I have created 2 jpgs in PluginDoctor at 44k1 and 48k to show the difference of the audio quality.
There are no modules inserted I just conneted the input with the output.

[cherryaudio Greg]

Hi,

Thank you for the suggestion, I'll pass it along to the software devs!

Greg

[wavemechanic]

I work at 96kHz. I don't see a problem with the harmonics analysis at 96kHz, but I do see a serious concern with the imposed filter applied at 96kHz. This seems to significantly harm signal above 10kHz. Cherry, why not use a Nyquist-style filter instead of this super gradual one? I've included a suggested filter based on the iZotope RX SRC.

[andro]

I don't quite understand where the signal you are measuring comes from. Can you explain? You said you connected the input to the output. What is driving this?

Also, Is this Plugin Doctor tool worth having?

[Harry Mudd]

@wavemechanic
My main sample rate is 44k1. All audio files are 44k1.
My question is why is the audio quality VM a lot better at 48k?
All my other synths are of good qualty independently of the sample rate.
Why not VM? Why the limitation at 48k?
confusing
H

[Captain]

VM always works internally at 48 kHz, while many/most synths and effects adjust their sample rate to match the outside world. With VM, if the external sample rate is different from 48 kHz, there's going to be some resampling, which always affects the sound quality. I guess the conversion algorithm could be improved, but since it happens in real time, there are latency- and CPU-related limits.

[cherryaudio Greg]

Hi,

Thanks for reporting this issue! The next update (2.0.24 or higher), will have improved resampling.

Greg

[andro]

Hi @Harry Mud, could you help me understand my question above? That would be great.

[Harry Mudd]

hi andro,
Plugin Doctoor is a nice tool to check the audio quality of plugins. If you have the knowledge about audio gear like frequency response and distortion then this tool is for you.
In my special case I loaded VMfx into Plugin Doctor and only connected the inputs with the outputs of VM to show the different audio quality of the VM subsystem with different sample rates.
H