How you record your music depends on what you want to achieve. A quick, built-in recorder in your arranger does a great job of capturing a 'Live' recording, warts and all. As long as you check your levels, maybe take a peek at the waveform display in an audio editor (Audacity makes a good free one) and check that you never exceed 0db (look for 'flat line' in the loud sections), you are good to go. Then all it is is down to you... Balance it in advance. Mind you, that one thing seems to elude most of us...

If you want to take things further... sky's the limit. Record the arranger Parts as a MIDI capture, edit the heck out of them, record them one by one into your computer as audio, or replace them with better VSTi's or other keyboards, play real guitar (or hire a pro), 'comp' your vocals, use a tad of Auto-tune, fly in audio loops...

It all depends on how far you want to take it.