Dieter, others may disagree, but here is my advice. Forget about TTS-1! It is ancient history and no where near represents the best product for the job in current BIAB.

For the past couple years PGM has provided a free version of VSTSynthfont. The installation file is downloaded with your BIAB version. You will need to search for a good .SF2 file to provide the sounds. But this will be the best option to get the best sounds from BIAB Midi. Come back if you need specific help on the installation. Many of the folks here use this option.

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6