From TOWER to SPIRE: Adding the Speech Modality to a Text-Only LLM. - Kshitij Ambilduke; Ben Peters; Sonal Sannigrahi; Anil Keshwani; Tsz Kin Lam; Bruno Martins 001; Marcely Zanon Boito; André F. T. Martins (CoRR, 2025)