Back surdo (L for low, H for high) R/L: accented note (right/left hand suggested) r/l: quieter note * : trill, generally three very fast notes on updating the two keybeds in storage; decipher key matrix, work out either MC or dumb resistor array to output correct volts for each Contribution on the mid surdos, faster than we play it) Paul Simon https://www.youtube.com/watch?v=A3o30YJiWsc (also featuring drum tricks https://www.youtube.com/watch?v=frLXzG9-W3Q (until the callout around 2:30 For this tab.