Step Sequencer

8 by 8 is 64

Linux 32bit
v0.5.0 2019-01-23 4.22 MiB
Windows 32bit
v0.5.0 2019-01-24 2.50 MiB
OS X Universal
v0.5.0 2019-01-24 9.28 MiB
Linux 64bit
v0.5.0 2019-01-23 4.42 MiB
Windows 64bit
v0.5.0 2019-01-24 2.66 MiB

source-code (all platforms)

screenshot