Update README.md

[ci skip]

README.md

@@ -21,7 +21,7 @@
 - [x] Add functionality for loading `.syx` files from SD card (e.g., using `getsysex.sh` or from [Dexed_cart_1.0.zip](http://hsjp.eu/downloads/Dexed/Dexed_cart_1.0.zip))
 - [x] Show voice name on optional [HD44780 display](https://www.berrybase.de/sensoren-module/displays/alphanumerische-displays/alphanumerisches-lcd-16x2-gr-252-n/gelb)
 - [x] Support selecting patches using MIDI Bank Change and Program Change messages
-- [ ] Get 8 Dexed instances to run simultaneously (like in a TX816) and mix their output together
+- [x] Get 8 Dexed instances to run simultaneously (like in a TX816) and mix their output together
 - [ ] Add a way to configure multiple Dexed instances through Performance sysex messages
 - [ ] Allow for each Dexed instance to be stereo shifted
 - [ ] Add reverb effect