I am a little bummed as I've had a cuple failures trying to set up my B9 with two EZB v4s... I installed the first one in the lower half and was able to successfully connect to it to test a couple functions (soil sampler activation and torso rotation). I removed it from its housing since I mounted it directly to a component board and never intend to use it to produce sound.
Today I worked on the second one. I did the sound modification as described in Dave Shulpius' fine tutorial but was disappointed with the outcome. When the ezb sound plays though my robot amp, it sounds crappy. The volume is low and its distorted. First I was thinking maybe I soldered to the wrong connection point since I was a little concerned when I watched the tutorial that my EZB v4 (bought very recently) looked different from the ones in the tutorial. The components on the board look different and there are more holes in the board in the tutorial. I figured I just had the latest version of the board and since there was only the one place to solder that matched the description in the tutorial of being before the on-board amp, I connected the positive there along with the ground on the side of the board near the power connector. I did also wire the output in paraller with the mp3 trigger's output thinking I could input sound to the robot's amp form either source but if the MP3 trigger is powered, the ezb will make no sound. The MP3 trigger works fine regard;ess.
Is the sound crappy because I have it wired parallel with the MP3 trigger? If so, why does that not cause the MP3 triggers sound to sound crappy?
More to come. Also cant connect to both boards and I broke two pins off the EZB when I was taking it apart to solder... I didn't bend the very much but I snapped off two pins trying to straighten them Bummed... Still seems to work without them though....