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@@ -268,7 +268,7 @@ model=<model>,addr=<addr>,[,port=system|dac][,base=<n>|100][,count=<n>|16][,intr
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- intr: real GPIO to use as interrupt.
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Each expander must be
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-Note that PWM ("led_brightness" below) is not supported for expanded GPIOs, neither connecting them to a rotary encoder (for speed reason) or high/precise signals like CS, D/C and RST and Ready. Depending on the actual chipset, pullup or pulldown might be supported.
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+Note that PWM ("led_brightness" below) is not supported for expanded GPIOs and they cannot be used for high speed or precise timing signals like CS, D/C, Reset and Ready. Buttons, rotary encoder, amplifier control and power are supported. Depending on the actual chipset, pullup or pulldown might be supported so you might have to add external resistors (only 23x17 does pullup)
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### LED
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See §**set_GPIO** for how to set the green and red LEDs. In addition, their brightness can be controlled using the "led_brigthness" parameter. The syntax is
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```
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philippe44