Eric is right, we need good scope to work with, I got into trouble displaying 2 signals of extreme frequencies, looks like the scope samples on the low frequency and misses the high frequency. otherwise there will be no room for samples to store for the low frequency.
If I reduce the timebase drastically to display the high frequency, I can see the rising edge of the low frequency. When I lower the timebase to see a complete cycle of the low frequency signal, i misses the high frequency signal.
Looks like this scope is ok for single channel or multi channel with same frequencies.
Mahmood