Setting gains with oscilloscope: Milliseconds settings?

[steele6794 10+ year member]

Picked up one of those DSO nanos to set my gains. Most tutorials ive watched have the timebase setting to 2MS which is fine for setting my sub amp but when I use that setting for my 4 channel amp for the Mids/highs the wavelength gets crazy and I cant tell anything by it.

If I set the timebase to .1 or .5 I dont get as many "waves" but I can clearly see the peaks. Does this setting make much of a difference or can I just set it to whatever gives me the cleanest image?

Thank you

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