diff --git a/src/modules/speex/protocols/rpc/rpc.client.ts b/src/modules/speex/protocols/rpc/rpc.client.ts
index e124551a5..67b437a7e 100644
--- a/src/modules/speex/protocols/rpc/rpc.client.ts
+++ b/src/modules/speex/protocols/rpc/rpc.client.ts
@@ -17,6 +17,7 @@ import { AudioPlayer } from '~/common/util/audio/AudioPlayer';
 
 import type { DSpeexEngine, SpeexSpeakResult } from '../../speex.types';
 import type { SpeexWire_Access, SpeexWire_ListVoices_Output, SpeexWire_Voice } from './rpc.wiretypes';
+import { SPEEX_DEBUG } from '../../speex.config';
 
 
 type _DSpeexEngineRPC = DSpeexEngine<'elevenlabs'> | DSpeexEngine<'localai'> | DSpeexEngine<'openai'>;
@@ -44,6 +45,7 @@ export async function speexSynthesize_RPC(
 ): Promise<SpeexSpeakResult> {
 
   // engine credentials (DCredentials..) -> wire Access
+  if (SPEEX_DEBUG) console.log(`[Speex RPC] Synthesize request (engine: ${engine.engineId}, ${text.length} chars) - options:`, options);
   const access = _buildRPCWireAccess(engine);
   if (!access) {
     const error = new Error(`Failed to resolve credentials for engine ${engine.engineId}`);
@@ -72,6 +74,7 @@ export async function speexSynthesize_RPC(
 
     // process streaming particles
     for await (const particle of particleStream) {
+      if (SPEEX_DEBUG) console.log('[Speex RPC] <-', particle);
       switch (particle.t) {
         case 'start':
           callbacks?.onStart?.();
@@ -134,7 +137,9 @@ export async function speexSynthesize_RPC(
     return result;
 
   } catch (error: any) {
-    // Cleanup
+    if (SPEEX_DEBUG) console.error('[Speex RPC] Synthesis error:', { error });
+
+    // cleanup
     if (audioPlayer)
       void audioPlayer.stop();
 
diff --git a/src/modules/speex/protocols/rpc/synthesize-elevenlabs.ts b/src/modules/speex/protocols/rpc/synthesize-elevenlabs.ts
index eb184e22d..81490b72c 100644
--- a/src/modules/speex/protocols/rpc/synthesize-elevenlabs.ts
+++ b/src/modules/speex/protocols/rpc/synthesize-elevenlabs.ts
@@ -4,6 +4,7 @@ import { fetchJsonOrTRPCThrow, fetchResponseOrTRPCThrow } from '~/server/trpc/tr
 
 import type { SpeexSpeechParticle, SpeexWire_Access_ElevenLabs, SpeexWire_ListVoices_Output } from './rpc.wiretypes';
 import type { SynthesizeBackendFn } from './rpc.router';
+import { SPEEX_DEBUG } from '../../speex.config';
 import { returnAudioWholeOrThrow, streamAudioChunksOrThrow } from './rpc.streaming';
 
 
@@ -53,6 +54,7 @@ export const synthesizeElevenLabs: SynthesizeBackendFn<SpeexWire_Access_ElevenLa
   // Fetch
   let response: Response;
   try {
+    if (SPEEX_DEBUG) console.log(`[Speex][ElevenLabs] POST (stream=${streaming})`, { url, headers, body });
     response = await fetchResponseOrTRPCThrow({
       url,
       method: 'POST',
diff --git a/src/modules/speex/protocols/rpc/synthesize-openai.ts b/src/modules/speex/protocols/rpc/synthesize-openai.ts
index 67371ad06..f4da9ac07 100644
--- a/src/modules/speex/protocols/rpc/synthesize-openai.ts
+++ b/src/modules/speex/protocols/rpc/synthesize-openai.ts
@@ -6,6 +6,7 @@ import { fetchJsonOrTRPCThrow, fetchResponseOrTRPCThrow } from '~/server/trpc/tr
 
 import type { SpeexWire_Access_OpenAI, SpeexWire_ListVoices_Output } from './rpc.wiretypes';
 import type { SynthesizeBackendFn } from './rpc.router';
+import { SPEEX_DEBUG } from '../../speex.config';
 import { returnAudioWholeOrThrow, streamAudioChunksOrThrow } from './rpc.streaming';
 
 
@@ -56,6 +57,7 @@ export const synthesizeOpenAIProtocol: SynthesizeBackendFn<SpeexWire_Access_Open
 
   // request.headers
   const { host, apiKey } = _resolveAccess(access);
+  const url = `${host}/v1/audio/speech`;
   const headers: HeadersInit = {
     'Content-Type': 'application/json',
     ...(!apiKey ? {} : { 'Authorization': `Bearer ${apiKey}` }),
@@ -95,8 +97,9 @@ export const synthesizeOpenAIProtocol: SynthesizeBackendFn<SpeexWire_Access_Open
   const dialectName = access.dialect === 'localai' ? 'LocalAI' : 'OpenAI';
   let response: Response;
   try {
+    if (SPEEX_DEBUG) console.log(`[Speex][OpenAI] POST (stream=${streaming})`, { url, headers, body });
     response = await fetchResponseOrTRPCThrow({
-      url: `${host}/v1/audio/speech`,
+      url,
       method: 'POST',
       headers,
       body,
diff --git a/src/modules/speex/protocols/webspeech/webspeech.client.ts b/src/modules/speex/protocols/webspeech/webspeech.client.ts
index c8588162d..d58453da5 100644
--- a/src/modules/speex/protocols/webspeech/webspeech.client.ts
+++ b/src/modules/speex/protocols/webspeech/webspeech.client.ts
@@ -9,6 +9,8 @@ import * as React from 'react';
 
 import type { DVoiceWebSpeech, SpeexListVoiceOption, SpeexSpeakResult } from '../../speex.types';
 
+import { SPEEX_DEBUG } from '~/modules/speex/speex.config';
+
 
 function _webspeechVoicesToVoiceOptions(browserVoices: ReadonlyArray<SpeechSynthesisVoice>): SpeexListVoiceOption[] {
   return browserVoices.map(v => ({
@@ -128,6 +130,7 @@ export function speexSynthesize_WebSpeech(
     speechSynthesis.cancel(); // safe
 
     // create utterance
+    if (SPEEX_DEBUG) console.debug(`[Speex][WebSpeech] New utterance (${text.length} chars, voice: ${voice.ttsVoiceURI}, s=${voice.ttsSpeed}, p=${voice.ttsPitch})`);
     const utterance = new SpeechSynthesisUtterance(text);
 
     // find and set voice by URI
@@ -144,15 +147,18 @@ export function speexSynthesize_WebSpeech(
 
     // set up event handlers
     utterance.onstart = () => {
+      if (SPEEX_DEBUG) console.debug(`[Speex][WebSpeech] Utterance started`);
       callbacks?.onStart?.();
     };
 
     utterance.onend = () => {
+      if (SPEEX_DEBUG) console.debug(`[Speex][WebSpeech] Utterance completed`);
       callbacks?.onComplete?.();
       resolve({ success: true });
     };
 
     utterance.onerror = (event) => {
+      if (SPEEX_DEBUG) console.error(`[Speex][WebSpeech] Utterance error`, event.error);
       const errorMessage = event.error || 'Speech synthesis failed';
       const error = new Error(errorMessage);
       callbacks?.onError?.(error);
diff --git a/src/modules/speex/speex.config.ts b/src/modules/speex/speex.config.ts
new file mode 100644
index 000000000..a935fa6a8
--- /dev/null
+++ b/src/modules/speex/speex.config.ts
@@ -0,0 +1,2 @@
+// configuration
+export const SPEEX_DEBUG = false;
\ No newline at end of file