You can find a chart for manually tuning notes here
As for playing the Machinedrum engines via midi notes though, easiest route is to get your hands on a Ruin Wesen Mini Command or the updated Mega Command Arduino hardware, both of which should allow you to run your Octatrack arps and sequencing directly without a computer.
Note: you may already be aware, but many of the Machinedrum machines that are tuneable have quite a limited range of pitch, which must be considered.