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Topic: About CD Sound Master VTM-M2 output (Read 1319 times) previous topic - next topic
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About CD Sound Master VTM-M2 output

Hello. I use foobar to playback audio from my PC.

Yesterday, I've added foo_vst component to foobar and I added the CD Sound Master VTM-M2 (Vintage Tape Machine) plugin:

https://cdsoundmaster.com/site/cds-software-online/vtm.html

It's an old vst plugin, I can't remember how many years ago I obtained it; but I liked it's warming my audio files (with "Warm-a-mix" preset).

My question is:

If I playback a 24 bit/192 kHz file (lossless, flac) with this vst plugin, does the output to DAC unit, again remains in 24 bit / 192 kHz; or can old CD Sound Master VTM-M2, reduces the bits-per-sample & sample-rate (let's say, to 16 bit/44.1kHz) ?

Is there a way to test the final audio's "bits per sample & sample rate" just before it's converted to analog in DAC units?

I hope I could explained it.

Thank you.

Re: About CD Sound Master VTM-M2 output

Reply #1 –
Quote from: Levent on
If I playback a 24 bit/192 kHz file (lossless, flac) with this vst plugin, does the output to DAC unit, again remains in 24 bit / 192 kHz; or can old CD Sound Master VTM-M2, reduces the bits-per-sample & sample-rate (let's say, to 16 bit/44.1kHz) ?
You can use your plugin with fb2k's converter (in converter's settings it can be added to active DSPs), convert to some lossless format and see what  samplerate output files will have and test them for "true" bitdepth with SoX or Adobe Audition. Testing for true bit-depth is needed because even if file has bitdepth 24 bit, lower bits can be just zeros.

Re: About CD Sound Master VTM-M2 output

Reply #2 –
Hi @Rollin... I've added the VTM-M2 vst plugin to the foobar's converter's "processing" section, and then converted a 24 bit/192kHz flac file to WAV.

I've a Cool Edit Pro 2.00 installed on my PC (I know as, Cool Edit Pro is the older brand of Adobe Audition, isn't it?), then I made "frequency analysys" to both files (original & newly converted).

Frequency's was okey, I didn't see any loss or cuttings in frequency graphic up to 192 kHz (but Cool Edit Pro always displays up the half of the sample rate, in here, up to = 96 kHz ?).

But, I couldn't find a way to test the "true bitdepth" in Cool Edit Pro.

Is there a way?

(I also downloaded the SoX, but I couldn't understand anything)

Re: About CD Sound Master VTM-M2 output

Reply #3 –
I don't know about Cool Edit Pro 2.00, but in Audition CS6 there is "Measured Bit Depth" in Window->Amplitude Statistics.
With SoX use command -n stats: sox.exe inputfile.wav -n stats
Results should look like
Code: [Select]
             Overall     Left      Right
DC offset   0.007322  0.007216  0.007322
Min level  -0.999847 -0.999817 -0.999847
Max level   0.999847  0.999817  0.999847
Pk lev dB      -0.00     -0.00     -0.00
RMS lev dB     -9.53     -9.41     -9.66
RMS Pk dB      -3.84     -3.84     -4.26
RMS Tr dB    -264.03   -264.03   -263.56
Crest factor       -      2.95      3.04
Flat factor     0.00      0.00      0.00
Pk count           9        16         2
Bit-depth      16/16     16/16     16/16
Num samples    15.7M
Length s     354.973
Scale max   1.000000
Window s       0.050
Row "Bit-depth" is what you need.

Re: About CD Sound Master VTM-M2 output

Reply #4 –
In Cool Edit Pro: Analyze -> Statistics -> Actual bit depth
To check bit depth you can use Bitter plugin. It shows a histogram, and will reveal if some bits rarely switch on, even if there is dither down in low bits. If ReplayGain is off, you can check the bit depth within Foobar.
 

Re: About CD Sound Master VTM-M2 output

Reply #5 –
Thank you friends.  I did it with the sox.exe;
Quote
C:\Program Files (x86)\sox-14-4-2>sox.exe d:\vtmcon.wav -n stats
             Overall     Left      Right
DC offset   0.000026  0.000026  0.000025
Min level  -0.209516 -0.207240 -0.209516
Max level   0.206738  0.206738  0.201023
Pk lev dB     -13.58    -13.67    -13.58
RMS lev dB    -28.23    -28.37    -28.09
RMS Pk dB     -21.46    -21.80    -21.46
RMS Tr dB     -48.63    -48.20    -48.63
Crest factor       -      5.43      5.32
Flat factor     0.00      0.00      0.00
Pk count           2         2         2
Bit-depth      22/24     22/24     22/24
Num samples    49.2M
Length s     256.000
Scale max   1.000000
Window s       0.050

C:\Program Files (x86)\sox-14-4-2>sox.exe d:\org24.wav -n stats
             Overall     Left      Right
DC offset  -0.000001 -0.000001 -0.000000
Min level  -0.517992 -0.512023 -0.517992
Max level   0.510710  0.510710  0.494810
Pk lev dB      -5.71     -5.81     -5.71
RMS lev dB    -21.04    -21.18    -20.91
RMS Pk dB     -13.96    -14.27    -13.96
RMS Tr dB     -42.68    -42.25    -42.68
Crest factor       -      5.87      5.75
Flat factor     0.00      0.00      0.00
Pk count           2         2         2
Bit-depth      24/24     24/24     24/24
Num samples    49.2M
Length s     256.000
Scale max   1.000000
Window s       0.050

C:\Program Files (x86)\sox-14-4-2>
First wav file (vtmcon.wav) is the 24/192 file converted with foobar with VTM-M2 vst plugin, where we see bit-depth: "22/24".

And the second file (org24.wav) is the original 24/192 file, where we see bit-depth: "24/24"