I experimented with various microphone placements using my Shure SM81 mics -- I like the crisp high-end and they have a very smooth mid- and low-end response. Generally I used an X-cross positioning, placing them above and below and obliquely to the sound board. I even used a full 180° opposition at times. I'm pretty pleased with the results.
Touch has a fair amount of semi-sequenced synth sounds. I used my technique of writing a sequencer (random in this case) using rtcmix~, then piping the MIDI output from Max/MSP through an Expert Sleepers ES8 module to control my Eurorack synth.
Drift is the only one where I did some overt processing of the piano. The beautiful sound of the Steinway still shines through, though.
I am happy with the outcome of these pieces. I like good piano sounds, and I like drones. We'll see how they wear in the future. But for now, these are me.