<p>Hey great idea! Where to place the patch for your effect is based on your preferences, and your specific effect. If you would like to pass the Drone Lab directly into the effect, the spot you mention would be fine. Make sure there is a DC blocking capacitor at the output of the effect before you patch it back into the Drone Lab's output. If instead you would want to use the effect in question on the raw oscillator mixer and LPF, and have the effected audio run through the distortion and band pass filters of the Drone Lab, then I would suggest you choose Break Out 1 (BO1 on schematic), which is located between C25 and R42&amp;R43. </p>
<p>As for the wet/dry mixer, I'm not entirely sure I understand your question. If the mixer is passive, it adds more or less relative resistance connecting two input signals (see the BPF Blend circuit in the Drone Lab schematic). If a mixer is active, both channels need to run through a capacitor (to block DC Voltages) in series with a resistor (to set the relative gain, where smaller input resistors have higher gain in the output mix). To blend two signals and fade from one to the other, such as a wet / dry blend, you can can change the input resistances to change relative gain, or you can attenuate the signals by passing them through a stereo pot wired with the two signals reverse of eachother, such that at one end the first signal is grounded and the second signal is at full level, and at the other end of the pot's movement the case is the opposite. </p>
<p>Thanks for the tip on the reverb delay board. As for the voltages of signals, honestly I don't know them offhand in the mixer networks of the Drone Lab, but you can measure them with an AC voltmeter and you can always pass them through a simple voltage divider to tone them down if they are too hot. Good Luck, can't wait to hear how it goes.
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