Getting sound and audio into Arduino projects has been difficult, because there are almost no integrated DAC and amplifier solutions for the Arduino Shield format. And there are fewer (none) that also have integrated microphone amplifier capability. Even the newer ARM based Arduino (Due, Zero, 101) boards with an on-board DAC don't have the headphone and op amp outputs, nor the microphone amplifier input, integrated on-board.<p>The Goldilocks Analogue has everything needed to build useful audio based projects, such as musical synthesizers, baby monitors, sound pollution monitors, and IOT audio applications.<p>Expanding on some of the project options...<p>Synthesiser - synthesising any waveform you like (using a look-up-table, or algorithmic calculation) is very cool. Then adding, convolving, and filtering these waves. Also cool. For anyone trying to get a handle on waveforms, and digital sampling and filtering (like me in 2nd year engineering) having a tool like this would have been great.<p>Anything using voice - How about a 802.15.4 mesh Walkie-Talkie? Xbee supports up to 24kbit/s real-world, I've demonstrated. With a bit of G.726 audio compression, you could talk to anyone "off grid" in a Xbee mesh using secure communications.<p>Capturing sound into an IoT Cloud service - A lot of low bandwidth networks (LoRa) can never support video, but they could support segments of audio. High compression encoding (no need for real-time), and then sending 15 seconds of audio surrounding an "event" over a LoRa network (0.3 kbps to 50 kbps) can provide context to the event, or be recognized and actioned by Siri / Cortana / Google in the Cloud.<p>I'm planning to make an audio environmental monitor which can sample sound at a location, and upload it to an IoT provider as needed. High sound levels alone are often not enough to determine what is good sound (wind noise), and what is bad sound (music at 3am), so having 15 seconds (for example) can be enough to differentiate a response.