CINSTIM, a powerful experimental CI tool based on a new, neural net-based robust speech-processing concept, has been implemented. The software package provides a user-friendly GUI. The implementation is block-oriented. That provides flexibility and the option of replacing or exchanging particular blocks for later modifications or extensions. With the first successful and promising patient test we have demonstrated the possibility of applying ANNs to CI speech processing (Leisenberg and Southgate, this suppl, section 16).