Balance or stereo-pan

[torsig1967]

I'd really need a balance or stereo-pan control to a lot af my patches, namely those who are stereo out. Patches with a stereo chorus are a typical example.

Has anyone some good idea how to implement this so it can be controlled by one single knob? I would prefer not to use morph since I almos always use all four morphs to something else.

[davep]

I don't have my NM1 in front of me now, just the Editor on this PC, but I made a patch that should do this.

It uses a pair of panner modules controlled by one knob. When you turn the knob, one side of a stereo signal gets louder and the other gets quieter because they each use different outputs from the two panner modules. There are other ways to do it but the Panner modules should give you proper audio taper as the knob moves. Try it and let us know if the volume behaves 'right' or if the level seems to go up & down with the knob movement. IF the panner modules don't work, there could be a similar idea that uses a pair of crossfader modules instead.

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Balance jpeg.JPG
Description:
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Balance control.pch
Description:		Download (listen)
Filename:	Balance control.pch
Filesize:	1.16 KB
Downloaded:	184 Time(s)

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[torsig1967]

Excellent davep, I believe that's the most elegant and correct way to implement this. 3,3% DSP is needed. Here is a DSP-cheaper solution (1,7%) which is a a bit 'wrong' since the level feels weaker when balance is set to middle. Anyone who can improve this without adding a lot of DSP?

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cheap balance.png
Description:	Cheap balance solution.
Filesize:	276.09 KB
Viewed:	5231 Time(s)

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[blue hell]

3.2%, but untested, I dont have the Classic connected.

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3.2.jpg
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[torsig1967]

Here is my best bet to implement a balance control with correct curve (not like my cheap one above) and a bit less CPU (2,7%) demand.

I use a "roof function" described in another post:
http://electro-music.com/forum/topic-29188.html

It's quite ugly to look at but if CPU needs get critical it might be a better choice than davep's and Blue Hells's much more elegant solutions.

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balance control2.png
Description:	A balance control with correct curve and 2,7% CPU load.
Filesize:	252.37 KB
Viewed:	5193 Time(s)

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[torsig1967]

[blue hell]

[Wout Blommers]

[torsig1967]

Here is a solution to the -3dB middle drop problem. Not very expensive; 2,6%. It can be used to achieve other values for the "middle drop" by adjusting the right rotary pots on the left middle add and right middle add control mixer modules.

While there are plenty of information on monoaural panning laws on the Internet it's hard to find any information on stereo balance laws. According to an article on Wikipedia http://en.wikipedia.org/wiki/Stereophonic_sound#Balance, there should be no drop at all when balance is set to the middle. On the other hand a quick test on my DAW (Logic and my sampler (MPC 1000) reveals a -3 dB drop when balance is set to middle.

I guess it's a matter of taste just like monoaural panning laws.

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balance -3dB middle.png
Description:	A stereo balance control where signal drops by 3 dB when balance is moved from full left or right to middle position.
Filesize:	220.67 KB
Viewed:	5125 Time(s)

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balance -3dB.pch
Description:	NM1 Patch file identical to the picture.	Download (listen)
Filename:	balance -3dB.pch
Filesize:	1.33 KB
Downloaded:	183 Time(s)

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[blue hell]