I would suggest using this thread, or heck maybe this one. This is all .lev all the time.

ETA: Concerning the SpeedSettings byte in [LAYR]INFO: if the first bit is set, then there's another byte between the SpeedSettings byte and the (potential) X/Y speeds. This byte appears only in battle1 and battle3, where both times it appears only for layer 5 and has the value of 02. It corresponds to the unknown2 bytes in .j2l files, which are also 02 for layer 5 in those levels only and 00 everywhere else. The values of the unknown2 bytes are read and saved intact by JCS, but I can't get them to do anything when changed, so... mystery "solved."