Norbert wrote: ↑March 7th, 2018, 5:23 pm There is a high pitched ding sound effect, similar to - I guess - gates fully opening or closing, or the spike sound, that plays occasionally. Seemingly out of nowhere, for no apparent reason. Even after playing all levels, it's still unclear to me what audio clue/indicator this is supposed to be. All I know is, from what I can tell, this is specific to your port. If you do not understand what I'm referring to, I could make a recording.
I also did some more digging to discover the origin of the mystery "ding" sounds that happen seemingly at random. It is actually the GateDown sound effect being played when a gate closes, regardless of where the player is in the level. To compound, if you have multiple gates closing then you will get all of the sound effects happening one after another even if you are many screens away. This is how the original Apple II code is written, and you can hear the effect on that version - it's just that the GateDown effect is just a small "tick" sound, not the more extravagent "ding!" that we have on BBC. Note that the code shares the same sound effect for GateDown and spikes appearing.David wrote: ↑February 17th, 2018, 2:10 pm * The sound of a gate completely closing can be heard even if that gate is not visible.
Just like in the SNES version: viewtopic.php?f=122&t=4149
I decided to fix this by only playing the sound effect if the gate is present on the visible screen (or the gate is on the edge of the visible screen.)