I am building an alarm clock and for the sound I’m using Sparkfun breakout board for a WTV020SD. It has a built in 1/2 watt 8 ohm amp, but I am thinking of using an external amp. The breakout board has a dedicated 16-bit DAC/PWM audio output to use with an external amplifier. My speaker is just a little 3W 4 ohm - Digikey 668-1234-ND. I’m thinking of using either an ISSI IS31AP2005 or Analog Devices SSM2305 audio amplifier. They seem to be the same thing to me, except ISSI is about $0.35, Analog Devices is $1.55. Is this a good choice for my application? In the example circuit (attached) from the data sheet’s I wasn’t sure how I should control the volume (I can’t do it with the WTV020SD breakout board). Would I put an audio potentiometer in for Rext? If so, do I need dual gang one? I’d like to just have a little trimmer pot for the volume.