Something weird going on. It is probably a high-frequency buildup at 22kHz, but it can be tricky to see the frequency, because it depends on how you set up the Voxengo Span (Free) in the Edit section, but you can definitely see the peak and rms value going up easily.
1. This is how to see the peak/rms values to change:
-Starting an Empty Project.
-Using the Voxengo Span (Free) on the Stereo Out, hitting START/PLAY →
Span shows the basic -200dB peak/rms readout.
-Adding Empty Audio Tracks, hitting START/PLAY →
Span shows the basic -200dB peak/rms readout.
-Filling the 1st Empty Audio Track with a Wav audio file, then MUTING IT and hitting START/PLAY →
Span still shows the -200dB readout.
-Filling the 2nd Empty Audio Track with a Wav audio file, then MUTING IT and hitting START/PLAY →
Span now shows a -194dB readout.
-Filling the 3rd Empty Audio Track with a Wav audio file, then MUTING IT and hitting START/PLAY →
Span now shows a -190.5dB readout.
-Filling 10 Empty Audio Tracks with a Wav audio file, then MUTING IT and hitting START/PLAY →
Span now shows a -180.0dB readout.
-The readout is getting bigger with every new Audio Track added.
-You have to hit start/play where the audio track events are. It does not matter if it contains an audio signal or it is just plain silence there in the audio event.
-If you hit start/play where no audio events exist Span goes back to -200dB.
-Note that Span needs 12 seconds to show the signal change when hitting STOP in Cubase. (The time it takes in Cubase to fade out to silence after hitting STOP…)
2. This is how to see the frequency that builds up:
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As I said, it is tricky to catch that little green line visually. I’m not sure why is that, but you can try if you want.
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Open Voxengo Span
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At the top right corner there is Edit. Click on it. It opens the Spectrum Mode Editor.
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Twist the Range Lo knob knob to -180.
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Now you can hit Start/Play if you filled the project with a minimum of 20 muted audio tracks, but still keep the Spectrum Mode Editor open.
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Now when the project is playing twist the knob “Freq Hi” upwards very slowly with holding down shift key on the keyboard until you see the little, thin green vertical line right around 22kHZ.
-DN-
CPU: Intel Core i7-4771 3.5GHz
Motherboard: Asus Z87 Pro
Memory: Corsair Vengeance 8GB DDR3 1600MHz CL9 Memory
GPU: Using the iGPU of the CPU (HD Graphics)
Audio Interface: Focusrite Saffire Pro 14
Windows 8.1 x64
Cubase 8.5.15 x64
Sample Rate @ 44.1kHz