He was able to get some help in the Adafruit Forums to solve the design challenges:
I am working on a project which I expect to power through a wall socket. I am using an Arduino Uno with a Wave Shield stacked on top. The Wave Shield will run through the Stereo 3.7W Class D audio amp and playback will be controlled through presses of a single button.
The first outdoor installation of the Stranger Reduction Zone occupies a corner near the main entrance to the Plaza of the Rockies in Colorado Springs. It is part of the city’s 15th Annual Art on the Streets outdoor art competition and year long exhibition. You can find it on South Tejon Street between Colorado and Vermijo Avenues.
Adafruit Wave Shield for Arduino Kit – v1.1: Adding quality audio to an electronic project is surprisingly difficult. Here is a shield for Arduinos that solves this problem. It can play up to 22KHz, 12bit uncompressed audio files of any length. It’s low cost, available as an easy-to-make kit. It has an onboard DAC, filter and op-amp for high quality output. Audio files are read off of an SD/MMC card, which are available at nearly any store. Volume can be controlled with the onboard thumbwheel potentiometer. This shield is a kit, and comes with all parts you need to build it. (read more)
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.