Step 5: Step 2: Creating the Audio Circuit.
Step 2 in assembly is inserting and soldering the audio circuit.
Important! The two electrolytic caps must be inserted with proper orientation. The negative side of each cap should be facing away from the plus sign on the board silk screen. Follow the image below and you'll be fine.
Insert the two 1k1 resistors (Brown, brown, red)
Insert the two caps at C4 and C5.
Insert the two electrolytic caps at C2 & C3.