Why Renoise uses the wrong in-/out- ports of my plugin?
While connecting to a LADSPA plugin Renoise can’t detect which audio ports are REAL audio (left-/right-) inputs and which are REAL audio (left-/right-) outputs. So Renoise assumes the first two input audio ports are left-input and right-input and the first two output ports are left-output and right-output. LADSPA plugins are designed to be something like basic blocks for synthesizer modelling environments. That means a single plugin can do just only logic operations (ring modulation between two audio signal, produce an ADSR envelope when an input audio signal is over defined threshold, and so on) or the plugin expects more than two audio in to produce its output (think about surround processors). That’s why Renoise can list a LADSPA plugin which output has no sense at all.