Hi! It’s so much easier with the sparkfun ATTiny programmer, but either way the connection points are the same.

Using jumpers (I used the ones that came with the Kastle!), bridge
Reset (1) to RES
Ground (4) to GND
5V (8) to +5V
Digital 2/Analog 1 SCK (7) to SCK
Digital 1 (PWM) MISO (6) to MISO
Digital 0 (PWM) MOSI (5) to MOSI

And then use the Arduino app to install the firmware. Kastledrum goes on the right, and Kastledrum_clk_lfo goes on the left.

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just got my kastle drum and really like it, however my v1.5 kastle synth triangle LFO stopped working. Everything else works fine, pulse LFO, stepped, etc. Anyone had this happen before and have any suggestions to fix it?

nice. thank you very much! did you also use the 10 uf capacatiator?