The Orange Kid is, basically, a subtractive synthesizer. It's named after a character of the old SNES RPG Earthbound; Orange Kid was one of two inventor kids in the game's second town (fittingly named Twoson; the other cities were called Onett, Threed and Fourside). You could invest into both inventors, but while giving Apple Kid your money was very useful (and indeed necessary for the storyline), Orange Kid gave you a completely useless machine and then probably spent the money on clothes or something.
How stuff works:
:: Envelopes
There are two ADSR envelopes. The first one is the normal amp envelope and can also modulate other parameters; the second is a modulation envelope that can, but needn't be applied to the amplitude. The modulation of each parameter works by the equation modulated=normal*(1+modulation*envelope).
:: Filters
Orange Kid has four resonant 2p lowpass/highpass filters. Each parameter of filters 2-4 (i.e. filter type, cutoff, and resonance) can work independently from Filter 1 or follow it in Slave mode. The filter routing parameter explains itself; so does the inertia parameter. The "Cutoff Limit" parameter determines what frequency "100.0%" as cutoff actually means. The note dependent settings for this follow pitch modulation, glide and vibrato.
:: Waveforms
Orange Kid has two oscillators; note that the two envelopes are completely unrelated to this. The parameters "Phase", "Transpose" and "Detune" only apply to the second wave relative to the first. "Noise Seed" is the seed for the random number generator used to make the Noise 1 and Noise 2 waves (especially with Noise 2 you're going to want to get the same wave as last time). Noise 1 turns to quasi-white noise when being shifted in pitch; this was originally a bug, but I left it in because I liked it. If you don't, that's your problem. The "Mix" parameter is self-explanatory. "Phase start" and "Phase end" may need explaining - they allow you to only use a portion of the wavetable and apply to both oscillators.
:: The other parameters
...are easy to understand. Glide time, vibrato depth and rate, global gain (I hate having to use dozens of cheapo amps), and global tuning.
:: Attributes
This does not need much explaining either. You can choose a MIDI channel for input (0 means none), turn MIDI velocity on and off, and record MIDI input, for which you need to be playing an empty pattern in record mode. The Env Mod Detail attribute is the number of samples the machine waits before doing its modulation stuff. Increase for lower CPU usage, decrease for (theoretically) higher quality.
:: Problems
In case it ever happens that the filters choke on something (which would result in the machine producing no sound) you can reset them via right click -> Reset Filters.
Also, sometimes the settings of the machine aren't read properly when you load a song that uses it. I have no idea what could possibly cause this (it looks like some parameters are reset to zero internally before Tick is called the first time; there is no reason at all why this should happen) and can therefore not fix it. Sorry.
