Hello, friends! Can you please listen to attached mp3 and tell, is it normal, or something wrong? Noise remains when i disconnect LCD and CS from the core. So far i can not exclude PSU (it's one from dvd player +12v/-12v/+5v) but noise lasts about half a second after switching PSU off. Cable from core to OPL3 board is about 12cm, soldered directly to core. Thanks in advance. And the OPL3 +5v led lights with only J2 connected. MBFM_noise.mp3