New hardware synth support added. Untested, so consider this experimental.

config/settings/settings.conf

@@ -35,9 +35,14 @@ progress_monitoring=True
 # Turn speech on or off:
 enabled=True
 
-# Select speech driver, options are speechdDriver or genericDriver:
+# Select speech driver, options are speechdDriver, genericDriver,
+# dectalkDriver, litetalkDriver, doubletalkDriver, or tripletalkDriver:
 driver=speechdDriver
 #driver=genericDriver
+#driver=dectalkDriver
+#driver=litetalkDriver
+#driver=doubletalkDriver
+#driver=tripletalkDriver
 
 # The rate selects how fast Fenrir will speak. Options range from 0, slowest, to 1.0, fastest.
 rate=0.5
@@ -70,6 +75,20 @@ volume=1.0
 # Select the language you want Fenrir to use.
 #language=en
 
+# Hardware speech synthesizer serial device.
+# Used by dectalkDriver, litetalkDriver, doubletalkDriver, and tripletalkDriver.
+# USB serial devices are supported if Linux exposes them as /dev/ttyACM*
+# or /dev/ttyUSB*. USB-only synths with no tty device need a separate driver.
+# auto checks /dev/ttyACM* first, then /dev/ttyUSB*.
+# Examples:
+# hardware_device=/dev/ttyACM0  # RPITalk USB gadget mode
+# hardware_device=/dev/ttyUSB0  # USB serial adapter
+# hardware_device=/dev/ttyS0    # built-in serial port
+hardware_device=auto
+
+# Serial baud rate for hardware speech synthesizers.
+hardware_baud_rate=9600
+
 # Read new text as it happens?
 auto_read_incoming=True