Near the Io torus outer boundary (L?8), the Voyager 1 plasma wave instrument detected high frequency (f) waves near one-half the electron cyclotron frequency fc. High resolution waveform measurements demonstrate that these f?Fc/2 signals are banded whistler mode chrous at f≲fc/2 and half-cyclotron frequency emissions with f slightly above fc/2. The high resolution spectral information, and the theory of whistler mode waves, permit us to estimate the density (~2.5 cm-3), energy (few keV), and omnidirectional energy flux (102 ergs/cm2-sec) of the electrons resonant with the chorus. Chorus precipitates about 6 ergs/cm2-sec of few keV electron energy to the Jovian ionosphere at L=8. Electrostatic emission, probably electron cyclotron half-harmonic modes, have also been detected near the magnetic equator in the Io torus region. At L=8, the multimode pitch-angle diffusion associated with the detected waves should produce a precipitation flux about a factor two below the 50 ergs/cm2-sec required to generate the observed auroral emission; however, the flux could well be larger deeper within the torus.