Add details to Usage section

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README.md

@@ -29,8 +29,14 @@ I am wondering whether we can run multiple Dexed instances, in order to recreate
 
 * Download from [GitHub Releases](../../releases)
 * Unzip
-* Put the files into the root directory of a FAT32 formatted partition on microSD card
+* Put the files into the root directory of a FAT32 formatted partition on SD/microSD card
-* Boot in Raspberry Pi 3 or 4
+* Put SD/microSD card into Raspberry Pi 1, 2, 3 or 4 (Zero and Zero 2 can probably be used but need HDMI or a supported i2c DAC for audio out)
+* Attach headphones to the headphone jack using `sounddev=sndpwm` in `config.txt`
+* Alternatively, attach a  PCM5102A or PCM5122 based DAC and select i2c sound output using `sounddev=sndi2s | sndhdmi` in `config.txt`
+* Alternatively, attach a HDMI display with sound and select HDMI sound output using `sounddev=sndhdmi` in `config.txt` (this may introduce slight latency)
+* Attach a MIDI keyboard via USB
+* Boot
+* Stat playing
 
 ## Building locally