New Rhodes Chroma CC+ firmware 218 offers MIDI Syncable LFO/Sweep & Microtonal Tuning

You can find ull details on the update on the excellent Rhodes Chroma site here.

Some details for reference (see the full link above for the complete list)

Feature Additions (Summary)

MIDI Syncable LFO/Sweeps
Ability to assign arbitrary frequencies to each key of the keyboard (Microtonal Tuning)

Feature Additions (Detail)

MIDI Syncable LFO/Sweeps
Starting with this firmware release, initial support for sync’ing the Chroma's Sweep generators to MIDI is added.

The Sweep Clock Source can be chosen by going into the Configuration Interface [Set Split 36] and selecting parameter 28 [P28].

The user has two choices, as below:

int = Internal Clock (normal Chroma operation)
nIdi = MIDI Clock (external sync operation)
When ‘int’ is selected, the sweep rate is determined by Chroma Parameter #9 (as per normal).

When ‘nIdi’ is selected, the sweep rate is determined by the MIDI timing clock (MIDI realtime message 0xF8). In this mode, Chroma Parameter #9 no longer directly controls the rate; instead, it behaves as a MIDI clock multipler.

Further details are discussed in the CC+ user manual: see Syncing Sweeps/LFO to MIDI.

Microtonal Tuning
This firmware release provides the user the ability to arbitrarily assign frequencies to each of the 128 defined MIDI notes and will support the custom tuning from MIDI as well as the on-board keyboard.

This “Microtonal Key Map” support can be enabled/disabled by going into the Configuration Interface [Set Split 36] and selecting parameter 31 [P31].

The user has two choices:

Off = Standard key mapping used (normal Chroma operation)
On = User-Specific key map used (Microtonal tuning enabled)
When ‘On’ is selected, the frequencies for each ‘key’ are defined by an internal lookup table, 128 entries in size (one entry for each possible MIDI note). The table is initialized by the receipt of a MIDI Tuning Specification Bulk Tuning Dump message."