There are no guarantees, but in general there are a few tips/tricks for getting the best out of tracking-type pedals:What changes to your playing did you make?
- If it's a two-pickup bass, either solo or favour the neck pickup
- Roll the tone knob down (perhaps even all the way), or on an active preamp, reduce the treble band
- Play with your fingers, not a pick, as close to the fretboard as feels comfortable
- If it's an octave pedal, or something that does sub-octave tones, generally speaking you want to play higher up the neck. Most notes below a B or even C tend to get pretty muddy. And likewise, for whatever reason, most octave pedals don't like notes below the 7th fret on the G-string of any bass I've tried, if you want to hold/sustain a note. Perhaps that's just me, but it seems to be a consistent trend I've encountered over many years.
- Make sure you don't have multiple notes/strings overlap with each other; come to a complete stop between each note, even if it's just for a split second. This is a big one! Multiple notes will "confuse" the pedal, since it won't know which note to track. Make sure to mute the other strings to make sure you are only cleanly playing one single note at a time.
- You don't have to baby it completely, but mellower attack generally helps the pedal latch on well to each note as it happens. And play as evenly in terms of strength as you possibly can to get consistent attack.
On that last point, some people also like putting compression before these pedals to help get even attack. But I've never personally found that necessary, even with "notoriously glitchy" pedals like the OC-2.
If these are things you knew already, then apologies for regurgitating a bunch of information that wasn't needed! But hopefully some of that is a little helpful