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There are four PT2399 Mods below.

If you purchased a PT2399 kit with the mods, you have everything you need for this next section.

Bill of Materials:

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feedBLAST MOD!

A great little and easy mod to your PT2399 digital delay Dev. Kit. By connecting Pin 8 of the PT2399 IC and one of the pins from one of the capacitors on the LEFT side of the PCB to a momentary switch, you can get a great feedback addition to your circuit.  To CUT DOWN on the harshness of this Mod, you can opt for a 220K resistor in between  the switch and PIN 8. Check out the photo below:

DIY FeedBLAST MOD

Check out this video as well that demonstrates this effect:

Check out how to mod your PCB to add a TRUE bypass MOD

PT2399 Feedback Modification for Delay

You will need a 50K Linear Pot (other values may work as well), wire and solder.  This is pretty easy to do, just connect one of your wires to the top via (near C17) of R11 and the other wire to the center pin of the MIX Pot.  Connect the other end of the leads to the center pin and one of the outside pins to the wires.

Also, check out the WARP – Tremolo mod

PT2399 Delay WARP Tremolo MOD

You will need wire, solder and a SPST switch for this MOD.  Connect one wire to the Negative Via on C15 (not a polarized component, but the silk screen still has the polarity) and the other wire to the right pit on the delay pot (20K).  Both remaining ends of the wires can now be connected to a SPST Switch.  Really Cool effect.  Check out the video below for a demo!