Amazon.com: 4-Port USB Hub 3.0, T-Sound USB Splitter for Laptop, Keyboard and Mouse USB Port Expander for MacBook, Mac Pro, Mac Mini, iMac, Surface Pro, XPS, PC, Flash Drive,SSD, Console, Printer, Camera :
Korg MINILOGUEXDM Minilogue XD Desktop Module/ Keyboard Voice Expander | Full Compass Systems
QuNexus USB MIDI CV Mini Keyboard Controller for Synthesizer | Keith McMillen Instruments
MDS-X Expander
Arp Rhodes Chroma Keyboard Expander Stack Switch Board Rare Vintage Analog Part | eBay
QuNexus USB MIDI CV Mini Keyboard Controller for Synthesizer | Keith McMillen Instruments
Amazon.com: USB Splitter for Laptop LOBKIN 4-Port USB Hub 3.0 with Separate ON Off Swich Slim Multiple Port Expander for Keyboard and Mouse Flash Drive Mobile HDD PC Mac : Electronics
Keyboard Expander - Zynthian: Open Synth Platform
Keyboard Expander - Zynthian: Open Synth Platform
Amazon.com: USB Hub 3.0, QUUGE 4-Port USB Splitter for Laptop [4ft Cable], Multi Port USB-A Expander with Micro Power [Fast Data Tranfer] Compatible with Keyboard, Mouse, Mobile HDD, Flash Drive, Printer PC :
3 Best Text Expanders for Chrome to Automate the Boring Stuff - TechWiser