The Mayflower is a true bypass, midrange overdrive pedal that falls in-between the Voyager’s low gain preamp settings and the Iron Horse’s full and harmonically rich distortion. The Mayflower boasts a transparent, midrange signal that is great for cutting through or adding to the rhythm. It includes Level, Drive, Bass and Treble controls for a large range of tonal versatility. The Mayflower provides a transparent and organic sounding breakup that allows tweaking and shaping to boost your original tone.
Only one channel of the second IC is being used, and that is only being used to buffer the reference voltage. There are a lot of pedals that work perfectly well without doing this, not least of which the pedal it's based on, and so as this is a low-ish gain Timmy with buffers I'm not too worried about excess noise. So to save space this layout removes the second IC completely and just uses a normal unbuffered voltage divider for vref. I don't expect any significant audible differences between the two so I think this is the one I'd build.