What do each do on the Ce-5 & CH-1

I was looking to get one of the two & i noticed that they both have rate, e level, & depth
but the ch-1 has a EQ knob & the CE-1 has a filter knob. I was just wondering what each knob did?

also if anyone has any suggestions on which one to get or alternative chorus under $90
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The EQ pot would probably control a high shelf to boost or cut the high frequencies. The filter is most likely a low pass filter. LPFs completely attenuate frequencies above their cutoff frequency. The pot would change the cutoff frequency.
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