Connect the USB soundcard to a different USB port. Avoid external unpowered USB hubs.

SRS Audio Sandbox 1.9.0.4 is a legacy audio enhancement tool that acts as a virtual sound card to improve audio quality system-wide Key Features & USB Support USB Soundcard Support

By default, early versions of SRS Audio Sandbox were designed to bind tightly to standard onboard motherboard audio chips (like Realtek or Sound Blaster PCI cards). However, version 1.9.0.4 introduced robust configuration options for external USB digital-to-analog converters (DACs) and USB soundcards.

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Official SRS Audio Sandbox typically supported onboard audio chips (Realtek, SigmaTel, IDT) and PCI/e soundcards. However, version 1.9.4—likely a circulated on forums like Ru-Board or FileCatalog —claimed to add explicit support for USB soundcards (e.g., Creative X-Fi USB, Logitech USB headsets, external DACs).