Re: Analog vs digital delay
I always think that digital are more 'useful' in more circumstances. Analog delays you get repeats which get warmer and mushier as they degrade, but with a digital pedal they simply reduce in volume OR filter off some of their high end meaning that they don't change your sound at all. This allows a digital delay to sit perfectly underneath your notes (because it is just YOUR sound repeated, not effected) and not stand out, while still having the crispness and clarity to do cool rhythmic stuff too.
In terms of doing slapback or room style reverb sounds I also find that digital delays like the DD-3 do a much more 'accurate' sound. I love the sound of analog delays, they are warm, lush and beautiful, but if I had to pick only one small delay unit for 90% of my gigs it'd probably be a digital styled one.
Fortunately in the modern age we don't really have to make choices like that. We have powerful digital delay units which can simulate the tones of tape, analog, digital and more. You can get a pedal which has the filtering and headroom of a tape delay but with the turn of a few knobs you can still have digital styled bright, accurate and unmodulated repeats. My Source Audio Nemesis has replaced all of the analog delays on my board because you get all of the darkness and subtle modulation of my favourite analog delays but with tap tempo and the ability to control the headroom and brightness of the bucket brigade delay.