How to Split One Keyboard into Two Manuals in GrandOrgue

Own a single 61-key MIDI controller but want to play a two-manual organ? GrandOrgue lets you divide one physical keyboard into two (or more) virtual manuals using per-manual key-range limits — no extra hardware required.

How the Split Works

Every manual in GrandOrgue has its own MIDI input configuration, including Lowest Key and Highest Key fields (MIDI note numbers, 0–127). Normally these span the full keyboard, but you can narrow them: assign the same physical keyboard to two different manuals and give each manual a different key range. Keys below the split point drive one manual, keys above it drive the other. This is the same “keyboard split” concept found on stage pianos and synthesizers — GrandOrgue simply applies it per manual.

Step-by-Step: Splitting a 61-Key Keyboard

This example splits a standard 61-key controller (MIDI notes 36–96) at middle C (MIDI note 60): the lower half plays the Great, the upper half plays the Swell.

1. Open Audio/Midi → Audio/Midi Settings and switch to the Initial MIDI Configuration tab.
2. Expand Manuals, then double-click Manual 2 (Great) to open its properties dialog.
3. Set Device to your MIDI keyboard, Event to “9x Note”, and Channel to 1.
4. Set Lowest Key to 36 and Highest Key to 59 (everything below middle C). Leave the velocity range at 1–127.
5. Confirm, then double-click Manual 3 (Swell) and configure the same device, event, and channel — but set Lowest Key to 60 (middle C) and Highest Key to 96.
6. Choose File → Save so the split is remembered the next time you load this organ.

Now play: the left hand controls Great stops, the right hand controls Swell stops, exactly as if you owned two keyboards. Middle C (60) is the first note of the upper manual; if you prefer the split one key lower, set the boundary to 59/60 instead of the 59/60 shown above — adjust to taste.

Choosing a Good Split Point

• Middle C (60) is the natural default — it mirrors how most dual-manual literature divides the hands.
• Below middle C (e.g. 55/56) gives the right hand more room for melody-heavy repertoire such as French toccatas.
• Remember the pedal gap: the lowest octave of a 61-key board (notes 36–47) is where a pedalboard would normally live. If your left-hand part goes very low, consider using the Manual-to-Pedal coupler instead of sacrificing keys.

What Splitting Cannot Do

A split is a compromise, and it is worth knowing the limits before you build a whole practice setup around it:

• Both “manuals” share one set of physical controls — velocity curve, aftertouch, and any knobs or sliders affect both divisions identically.
• You cannot give the two halves different transpose settings through the split itself; transpose is per organ, not per manual.
• Very wide repertoire (say, a left hand that spans three octaves) will feel cramped. At that point, a second inexpensive used keyboard — even a 49-key one — is a better upgrade than a cleverer split.

Next Level: Add a Pedalboard for Three Divisions

The classic organist’s setup is two hands plus feet. Once your split is working, the biggest single upgrade is a MIDI pedalboard: map it to Manual 1 (Pedal) in the same Initial MIDI Configuration tab (it usually arrives on its own MIDI channel, so no key-range tricks are needed). With the split keyboard plus pedals, a single modest controller stack plays a full three-division organ. The complete buying and wiring guide is at MIDI pedalboards for GrandOrgue.

FAQ: Keyboard Splits in GrandOrgue

Can I split one keyboard into three manuals?

Yes — the Lowest Key / Highest Key fields exist on every manual, so you can carve a 61-key board into three ranges (for example Great / Swell / Choir). Each division gets narrow, so this works best on 76- or 88-key controllers.

Will the split survive when I load a different organ?

The Initial MIDI Configuration can be saved per organ (File → Save) or exported as a reusable MIDI settings file. If you set up the split while no organ is loaded, it becomes part of your global defaults.

Does the split affect the on-screen keyboards?

No. Key-range limits apply only to incoming MIDI events from your configured device. Clicking the on-screen manuals with the mouse still plays the full compass of each division.

My keyboard transmits on two channels — do I even need key ranges?

If your controller can send different key zones on different MIDI channels, you can skip the key-range fields and simply assign Manual 2 to channel 1 and Manual 3 to channel 2. The result is identical; key ranges are for controllers that only transmit on one channel.

Keep exploring: MIDI not working in GrandOrgue if notes refuse to arrive, MIDI pedalboards for GrandOrgue for the feet, and building a full virtual organ console when one keyboard is no longer enough.