How to transpose a Midi piece

[k.r.johnson]

Firstly I'm new here so if I'm asking a stupid question or it doesn't mean anything, please tell me. 

Is there a way to change the pitch of a Midi file, for example, can I take a piece up one tone or down two tones? Thanks.

This is an amazing site. I wish I'd known about it a long time ago.

[Cool172]

once you import it, you can drag all the notes up or down, but this might cut off some especially high or low notes. you can also just go into the advanced options and detune each instrument up or down.

[Jacob_]

OS isn't really made for midi editing, but yeah like he said you can just drag the notes up and down after importing.

[SnakeyWaters]

Oh and at the top there is a "select all" button, so you can use that to select all the notes in your piece. Then you can just drag all the notes up or down

[Lopyt]

Select all can also be done with ctrl+a