How to Use the APF-D Processor: Rewind, Slow Down, and Decipher Responses

Gary Galka

Published on: 06/07/2026

The APF-D Processor is an Audio Playback Filter for ITC research. How to pause without losing data, rewind in 10-second intervals, slow playback, and filter noise to decipher a response.

Technology & Innovation

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What Is Frequency Overlap? How the PSB7-PRO Creates Clustered Hot Spots

Gary Galka

Published on: 06/07/2026

Frequency overlap is the technique behind the PSB7-PRO Spirit Box. Gary Galka explains adjustable frequency steps, clustered hot spots, and why they give responses more room to form.

Technology & Innovation

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What Is ITC? A Plain-English Introduction to Instrumental Trans-Communication

Gary Galka

Published on: 06/07/2026

ITC, or Instrumental Trans-Communication, is the use of electronic instruments to capture and study possible responses. A plain-English introduction to the history, the method, and the tools.

Research & Analysis

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