What kinds of sounds are in the internal synthesizer?
The internal synthesizer is a simple unit which has the basic General MIDI soundset, plus a second bank of alternate sounds which are variations on the same sound set. It is a sample-based synth, which in its basic form is comparable in quality to the GM sounds of the Windows or Mac OS software synths. The main advantage of having this internal synth is that it tremendously simplifies use of the keyboard, allowing the keyboard to make music simply by powering up, using only a single power cord and no external MIDI cables, MIDI modules or amplifiers. This is a considerable advantage since external MIDI gear can require its own setup steps, including power-up sequences and configuration, and lugging around more equipment including heavy amplifiers makes the whole process of using the keyboard more work. Additionally, having an internal synthesizer allows the physical controls of the synth to be used to tweak the sounds in special ways. TPX2s and 4s have controls for shaping the waveform
