I've been practicing with a keyboard for almost two years now. I bought my keyboard used and it came with a lower quality pedal that I didn't use much. The pedal eventually broke (always sustaining) so I stopped using it.
I just bought an M-Audio SP 2 universal sustain pedal. When I tried it out, I was surprised to find that with what I think is my normal foot raise/lower to to end/start a sustain, my sustain doesn't quite fade all the way out before I'm sustaining again, so it quietly remains. I specifically find that even if I let the pedal go completely up, if I push down again fast, that a significant amount of the previous sustain remains. This doesn't seem like correct piano-like behavior from when I have played pianos in the past.
I saw online that some sustain pedals are binary and some allow fine control over a precise sustain hold, more similar to a real piano, but I didn't know that before.
My new sustain pedal definitely has a much larger range of motion than the one I was using before. And I haven't played on pianos enough to compare my new sustain pedal well with how they work on pianos.
And to compound all of this, my right ankle (that I use to sustain) still suffers occasional slight swelling from a long-ago sprain, and recently has been one of its swelling episodes, so my range of motion in that ankle isn't quite up to normal.
Bottom line question
Is it normal for a keyboard sustain pedal to not completely fade out the previous notes before sustaining again? Or is this probably due to my inexperience with sustain pedals in general? (for example, I'm not actually moving the pedal up high enough fast enough or something)
Edit: keyboard model is Yamaha P-70.