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OK. stereo is very important - for listening at home, and in the shop. A good stereo image can mean the difference between 'Nice ideas' and 'Yeah! WICKED!!!'
Mono is also very important! consider:
Most radios are mono.
Most TVs are mono.
Most clubs are mono.
So, if you want your track to sound good on all these systems you're going to have to make sure you don't get any phasing/cancellation artifacts.
Also, if converting to mono kills all the power in your bass, this could indicate that you have negative phase problems that will cause big problems if you want to move to vinyl.
(Most engineers will drop to mono if this happens. Not good!)
So:
1: To test mono, see if your sequencer/mixer/sampler/whatever has a mono toggle. Most do, for the reasons stated above.
2: If not, mix the two channels together at equal levels.
3: Make sure everything is in its right place. If any sounds disappear, you have negative phase issues and they must be addressed (unless you're using it for effect and don't care about mono, like Nine Inch Nails did once).
Negative phase is simply one waveform of a stereo pair being inverted (turned upside down). You can fix this with a phase invert switch on a mixer channel, the 'Gainer' plugin in Logic, or by selecting and inverting one half of the wave in a sample editor. Or however you can.
(as an aside, you will be creating negative phase all the time if your speakers are wired incorrectly. Check it out. Play a speech sample, invert the waveform of one side of the stereo pair, and listen again. The in phase sound should come from the centre. The out of phase sound should come from 'outside' the range of the speakers. Your ears will feel strange as you move away from one speaker and towards the other. Negatively phased speakers lose a lot of bass power).
Negative phase can be caused by a balanced jack that hasn't been plugged in fully (full negative phase). Or big reverb/chorus/phaser effects on bass sounds (the sound will go in and out of phase over time). Or incorrect recording. Or several other things.
Negative phase in the bass region can cause a needle to flick itself out of a record groove. It's OK on CDs...
Get a vectorscope. This will give you a visual representation of the stereo image, as well as telling you if you're suffering from negative phase. There's one in Wavelab, called the Phasescope.
T*
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