For some reason, the dual lowpass (with the spacing set to zero) sounds better than the regular lowpass on my Voyager.
Anyone else experience a change between the filter modes?
WHat exactly do you mean? Are you talking about a Voyager with an external lowpass filter or listening to the voyager in Mono?
Because of my headphones, Ive only been listening to the Voyager in mono, but I have heard sopme stereo tricks with panning and the spacing.
I think i prefer it in mono almost.
Eric
What do you mean by “regular lowpass”? The voyager has 2 lowpass filters that can be used in parallel with the outputs on the left and right connectors, or both of them mixed together in one mono channel.
The other mode is “lowpass/highpass” which connects one lowpass INTO the second one set as a highpass, effectively creating a “bandpass” filter with an adjustable “bandwidth” with the spacing knob.
That last mode will leave only the frequencies inside the bandwidth, and cut everything else higher and lower than that band.
I meant, that in stereo, a patch sounds better if the filter is in
-Dual Lowpass Mode (with the spacing set to zero; thus nullifying the stereo filter effect)
A patch sounds weaker to me if the filter is set to
-Lo/Hi pass mode (with the spacing set to -5; which should be low pass)
I’m confused, because shouldn’t both these filters produce the same exact timbre?
EDIT: I discovered the problem. My Voyager drops the volume slightly when I switch to Lo/Hi mode. We all know synths sound better when they’re louder 
As I explained in my last reply, when the mode is set to Lo/Hi pass mode, it is effectively becoming a bandpass filter and NOT simply a lowpass. Even with the spacing set to -5 it only sets a larger band but it will still cut some of the low frequency content. That’s why dual lowpass will always sound “fuller” as it only cuts the high frequencies.
Take a look at the filter section in the user’s manual, there are some graphics there that show the difference between a lowpass and a bandpass filter.
Just trying to help… 
How about this:
In this image the lowpass has more bottom end…no high frequencies. Bandpass has no top or bottom frequencies. Frequency range is adjustable with cutoff and spacing.
But even if you compare a stereo low pass filter setting with a mono one using the left output and the same setting and the zero spacing, you might notice a subtile difference. This might be because of the two filters not being 100% identically due to their analog nature.
And summing the stereo output to mono also sounds a tiny bit different.
Of cause, the very same levels should be used to test this.