Support · SMEAR · Latest 1.2.1, 2026-11-07

SMEAR firmware

Update SMEAR firmware

Latest: v1.2.1 (2026-11-07)

Connect USBLeave the Daisy Patch SM in the module; do not take it apart. Connect a USB data cable from your computer to the USB port on the Patch SM.
Enter update (DFU) modeOn the Patch SM, push and hold the BOOT button. While you hold BOOT, push and release RESET. Then release BOOT. The module stops making sound; this is normal.
ConnectClick Connect and choose DFU in FS Mode (it can also show as STM32 BOOTLOADER).
Flash
Version
Do not unplug USB or close this page while it flashes. It takes less than a minute.

Troubleshooting

The list is empty. The module is not in DFU mode. Do step 2 again, and try another USB cable (some cables carry power only).
Windows: the device shows but will not connect. The bootloader needs the WinUSB driver. Install it once with Zadig: choose DFU in FS Mode, select WinUSB, click Replace Driver.
The update stopped part-way. Nothing is broken. The bootloader is in ROM. Enter DFU mode again and flash again.

07/11/2026

new - config drive: connect USB and a drive called SMEAR appears. Set the stages for each TAP slider (up to 160 poles) and bipolar feedback in CONFIG.TXT
new - when the module cannot use a config line, the slider LEDs flash and CONFIG.TXT shows the reason. You do not need to reconnect the drive
new - all LEDs flash if the firmware stops

31/03/2026

new - audio rate modulation on CV inputs is now more snappy
new - better volume compensation for high feedback
new - in dual mono mode stage pole count is now doubled, now 4 to 196 stages instead of 2 to 98
fixed - resonance and amplitude peaks when moving Q and frequency, fixed in the filter DSP
fixed - some low level digital noise
fixed - split button status is now remembered on power cycling.

Original launch firmware