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This page details how to author Overdrive (OD) for your song.
Overdrive is the same thing as Star Power in Guitar Hero: A meter you fill by comboing certain marked parts of a song, and when half-full or more it can be activated to double your points and stop your from failing out while active.
Authoring OD for your chart is a super important step, as without it your chart will be impossible to earn a gold star rating on when playing on Expert.
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Overdrive is authored on the MIDI note G#7 116, right above the Expert chart, on all instruments. All other notes that appear during the duration of this marker will turn into an Overdrive note in-game. Vocals have their own Overdrive rules which will be explained further down.
When authoring OD, these are some basics to keep in mind:
Keep in mind Vocals have a completely different system with its own rules, which is described further down on this page.
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Unison Phrases are Overdrive markers that appear on multiple instruments at the same time, awarding bonus energy for hitting it on all those instruments. You'll want one of these about every 20-28 measures in your song, unless there are long breaks where only one instrument is playing. This equates to between 3-5 Drums OD activation lanes between each Unison in most cases.
Here is an example of how it should be set up (the single OD in between can of course be placed anywhere and not just dead center between unisons):
To chart these, simply author an Overdrive marker at the exact same spot and length for every instrument you want to include in it. In most cases, you'll want to include as many instruments as possible.
It often feels cool to include the first note of the next measure after the phrase when authoring these, as when you hit it the final note of the unison makes a loud “woosh” sound effect.
Be aware that Vocals overdrive functions completely independently of the other instruments, and as such cannot be part of a unison.
This method makes the process much faster and easier once you get used to the keyboard shortcuts.
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Vocals OD is also authored on the MIDI note G#7 116, but with a catch: it has to line up perfectly with the phrases on both Solo Vocals and HARM1. It is not authored at all on HARM2/3, as they will automatically use the OD data of HARM1.
You'll want to make every 4-5 phrases a OD phrase in most cases. If you can't activate OD during the final part of a song, do not author any beyond the point of when you'll be able to activate. If you're unsure, playtest this before releasing your chart.
If HARM1 and Solo Vocals OD phrases don't line up due to Harmony stuff, see if you can adjust phrases on one of them to fit the other while still keeping any HARM2 or HARM3 notes in the mix covered by it still.