MusicTechHelpGuy fixes a synth lead that landed an octave too low, with two quick options depending on where you are in the process.
Still playing it in? Use your MIDI controller's octave up or down buttons to shift the range in real time until the part sits right.
Already recorded in Logic Pro? Select the MIDI region, hold Option and Shift, then hit Up or Down. The notes jump a full octave instantly, with a +12 or -12 marker on the region confirming the shift.