More attempts at getting this usb dectalk working.

README.md

@@ -81,13 +81,16 @@ Fenrir is a Linux screen reader. Linux is the only officially supported platform
    - espeak or espeak-ng (or any TTS command)
 3. **dectalkDriver** - Serial DECtalk-compatible hardware speech driver
    - RPITalk gadget mode or a DECtalk-compatible serial device
-4. **litetalkDriver** - Serial LiteTalk-compatible hardware speech driver
+4. **dectalkUsbDriver** - Native Access Solutions DECtalk USB driver
+   - USB ID `0dd0:2001`
+   - PyUSB and a libusb backend
+5. **litetalkDriver** - Serial LiteTalk-compatible hardware speech driver
    - RPITalk gadget mode or a LiteTalk-compatible serial device
-5. **doubletalkDriver** - Serial DoubleTalk LT-compatible hardware speech driver
+6. **doubletalkDriver** - Serial DoubleTalk LT-compatible hardware speech driver
    - DoubleTalk LT; does not support the internal DoubleTalk PC card
-6. **tripletalkDriver** - Serial TripleTalk-compatible hardware speech driver
+7. **tripletalkDriver** - Serial TripleTalk-compatible hardware speech driver
    - External DB9 serial TripleTalk devices, or USB models that expose a tty serial device
-7. **debugDriver** - Debug speech driver for testing
+8. **debugDriver** - Debug speech driver for testing
    - No dependencies
 
 
@@ -459,15 +462,22 @@ setting <action> [parameters]
 - `speech#volume=0.1-1.0` - Speech volume
 - `speech#voice=voice_name` - Voice selection (e.g., "en-us+f3")
 - `speech#module=module_name` - TTS module (e.g., "espeak-ng")
-- `speech#driver=driver_name` - Speech driver (speechdDriver/genericDriver/dectalkDriver/litetalkDriver/doubletalkDriver/tripletalkDriver)
+- `speech#driver=driver_name` - Speech driver (speechdDriver/genericDriver/dectalkDriver/dectalkUsbDriver/litetalkDriver/doubletalkDriver/tripletalkDriver)
 - `speech#hardware_device=/dev/ttyS0` - Hardware synth serial device for dectalkDriver/litetalkDriver
 - `speech#hardware_baud_rate=9600` - Hardware synth serial baud rate
 - `speech#history_size=50` - Number of spoken items kept in runtime speech history
 
+The native Access Solutions DECtalk USB, USB ID `0dd0:2001`, uses
+`dectalkUsbDriver`. It is autodetected and does not use
+`speech#hardware_device` or `speech#hardware_baud_rate`. Install PyUSB and a
+libusb backend first. From a source checkout, use
+`python3 -m pip install '.[dectalk_usb]'`; distributions may package PyUSB as
+`python3-usb` or `python-pyusb`. Root-run Fenrir can access the device directly.
+A non-root Fenrir process needs a local udev rule granting its account
+read/write access to `0dd0:2001`; do not make the device world-writable. Other
 USB hardware synths are supported only when Linux exposes them as a serial tty
-such as `/dev/ttyACM0` or `/dev/ttyUSB0`. A USB-only TripleTalk with no tty
-device would require a separate USB protocol driver. Use an explicit
-`speech#hardware_device` path for hardware speech.
+such as `/dev/ttyACM0` or `/dev/ttyUSB0`. Use an explicit
+`speech#hardware_device` path for serial hardware speech.
 - `speech#auto_read_incoming=True/False` - Auto-read new text
 
 *Sound Settings:*