It's not as versatile or easy to use as a powerful ALT implementation - you can only use edge-triggering on each channel (as opposed to different trigger types for each channel) - but it's better than nothing when trying to look at two un-synced waveforms.
Yes, 1-0 better than nothing.
Without this un-sync signals just game over exept if can accep play run/stop game in some cases where it may give some kind of solution for random rare needs. Perhaps also most of users never need? But yes I remember one "show". (it was mistake).
People check freq reference using analog oscilloscope. Both channels show 10MHz references outputs. After some short time oscilloscope show nice sinewaves and guy tell me they are exactly. Yes I look also some seconds his scope screen and yes no any detectable shift. Show was nearly end. But in my head red light go on... wait a minute.. they are normal well adjusted high class OCXO's. But red light in my head becouse it was too stable.... may I look agen.
Then I ask how you have adjusted these...
"no no-... I just only connect these for check and they looks very very good so I did not yet adjust. "
Scope was still on. oh... no any drift and there is now long time... minutes.
ALT !! ... your oscilloscope is in ALT mode!
turn to CHOP... wau... other channel signal go so fast that can not see waveform at all.
Perhaps tens of Hz difference.
"What is it... why? Normally I do not touch this switch"