All the sims on the dd20 still sound... digital to me. Digital with a special flavour.
Things I love about the dd20:
- dotted eight tap tempo ability
- easily visible indicators and lcd readout
- 'modulate' delay on high speeds simulate choruses quite well
- extremely clean digital delays
- very tweakable speeds, with a readout
- did i mention the readout?
- and the tap tempo?
Things that sometimes make me pull my hair out:
- I wish it had a 'repeats' knob. It has a feedback knob, but that affects how the notes decays at the same time as the number of repeats (like most delays do). I wish I could make it do, say, exactly 3 repeats at the same volume.
- Not enough footswitches. I need at least one more to use the sound on sound properly. I'm having to use a setting where I need to step on both footswitches at the same time to change patches, and I sometimes miss.
- Wish it had better sound on sound capabilities. But I guess that would ruin Boss's marketing on their RC line.
Things I like about the DL4:
- looks cool
- great interesting delays
- great sound on sound capabilities
- great control for some of the settings with expression pedal
- good patch switching capablities with the number of footswitches
Things I didn't like:
- reports of reliability issues
- lack of dotted eight tap tempo
- less pristine digital delay
- no readout, settings are done via analog controls set to roughly where you want it.
This is more or less what I can think of now.