I've used the DL4 for many years and even with the Keeley mod it still has a noticeable tone suck. It's stayed on my board for two reasons mainly, the Auto-Volume Swell and the Loop feature are both easy to use and get usable sounds from quickly. I'd love to upgrade to a higher quality delay pedal, but am afraid mainly to lose the Auto-Volume feature. Some considerations: - Line 6 M9/M5 (but do these units suffer from the same tone suck of the DL4?) - Boss SG-1 Slowgear or BYOC Lazy Sprocket (but I'd have to pair this with a separate delay). What would you guys suggest?