diff --git a/src/main/aciodrv/kfca.c b/src/main/aciodrv/kfca.c
index 0149d11..000656f 100644
--- a/src/main/aciodrv/kfca.c
+++ b/src/main/aciodrv/kfca.c
@@ -37,7 +37,12 @@ static bool aciodrv_kfca_watchdog_start(uint8_t node_id)
     */
 }
 
-static bool aciodrv_kfca_amp(uint8_t node_id)
+bool aciodrv_kfca_amp(
+    uint8_t node_id,
+    uint8_t primary,
+    uint8_t headphone,
+    uint8_t unused,
+    uint8_t subwoofer)
 {
     struct ac_io_message msg;
 
@@ -45,12 +50,10 @@ static bool aciodrv_kfca_amp(uint8_t node_id)
     msg.cmd.code = ac_io_u16(AC_IO_CMD_KFCA_AMP_CONTROL);
     msg.cmd.nbytes = 4;
 
-    // yes this sets the amp to 100% volume
-    // TODO: expose this to sdvxio instead at some point
-    msg.cmd.raw[0] = 0;
-    msg.cmd.raw[1] = 0;
-    msg.cmd.raw[2] = 0;
-    msg.cmd.raw[3] = 0;
+    msg.cmd.raw[0] = primary;
+    msg.cmd.raw[1] = headphone;
+    msg.cmd.raw[2] = unused;
+    msg.cmd.raw[3] = subwoofer;
 
     if (!aciodrv_send_and_recv(
             &msg, offsetof(struct ac_io_message, cmd.raw) + 1)) {
@@ -69,7 +72,7 @@ bool aciodrv_kfca_init(uint8_t node_id)
         return false;
     }
 
-    if (!aciodrv_kfca_amp(node_id)) {
+    if (!aciodrv_kfca_amp(node_id, 0, 0, 0, 0)) {
         return false;
     }
 
diff --git a/src/main/aciodrv/kfca.h b/src/main/aciodrv/kfca.h
index 7722f42..9f146bd 100644
--- a/src/main/aciodrv/kfca.h
+++ b/src/main/aciodrv/kfca.h
@@ -30,4 +30,22 @@ bool aciodrv_kfca_poll(
     const struct ac_io_kfca_poll_out *pout,
     struct ac_io_kfca_poll_in *pin);
 
+/**
+ * Set the KFCA digital amp level
+ *
+ * @param node_id Id of the node to query (0 based).
+ * @param primary primary volume (96-0)
+ * @param headphone headphone volume (96-0)
+ * @param unused unknown volume (96-0) (unused)
+ * @param subwoofer subwoofer volume (96-0)
+ * @return True on success, false on error.
+ * @note Note 96 (or 100?) is lowest volume level, 0 is highest
+ */
+bool aciodrv_kfca_amp(
+    uint8_t node_id,
+    uint8_t primary,
+    uint8_t headphone,
+    uint8_t unused,
+    uint8_t subwoofer);
+
 #endif
diff --git a/src/main/bemanitools/sdvxio.h b/src/main/bemanitools/sdvxio.h
index 5778e0d..c3dfa83 100644
--- a/src/main/bemanitools/sdvxio.h
+++ b/src/main/bemanitools/sdvxio.h
@@ -98,4 +98,8 @@ uint16_t sdvx_io_get_input_gpio(uint8_t gpio_bank);
 
 uint16_t sdvx_io_get_spinner_pos(uint8_t spinner_no);
 
+/* Sets the volume of the digital amps if possible */
+
+bool sdvx_io_set_amp_volume(uint8_t primary, uint8_t headphone, uint8_t subwoofer);
+
 #endif
diff --git a/src/main/sdvxhook/kfca.c b/src/main/sdvxhook/kfca.c
index f4d8894..69780ce 100644
--- a/src/main/sdvxhook/kfca.c
+++ b/src/main/sdvxhook/kfca.c
@@ -15,7 +15,7 @@
 
 static void kfca_send_version(const struct ac_io_message *req);
 static void kfca_report_status(const struct ac_io_message *req, uint8_t status);
-static void kfca_report_0128(const struct ac_io_message *req);
+static void kfca_amp_control(const struct ac_io_message *req);
 static void kfca_poll(const struct ac_io_message *req);
 static void kfca_poll_thunk(void *ctx_ptr, struct ac_io_message *resp);
 
@@ -60,7 +60,7 @@ void kfca_dispatch_request(const struct ac_io_message *req)
 
         case AC_IO_CMD_KFCA_AMP_CONTROL:
             log_misc("AC_IO_CMD_KFCA_AMP_CONTROL(%d)", req->addr);
-            kfca_report_0128(req);
+            kfca_amp_control(req);
 
             break;
 
@@ -110,7 +110,7 @@ static void kfca_report_status(const struct ac_io_message *req, uint8_t status)
     ac_io_emu_response_push(kfca_ac_io_emu, &resp, 0);
 }
 
-static void kfca_report_0128(const struct ac_io_message *req)
+static void kfca_amp_control(const struct ac_io_message *req)
 {
     struct ac_io_message resp;
 
@@ -120,6 +120,12 @@ static void kfca_report_0128(const struct ac_io_message *req)
     resp.cmd.nbytes = req->cmd.nbytes;
     memcpy(resp.cmd.raw, req->cmd.raw, req->cmd.nbytes);
 
+    // bytes 0-4: main, headphone, unused, subwoofer
+
+    if (!sdvx_io_set_amp_volume(req->cmd.raw[0], req->cmd.raw[1], req->cmd.raw[3])) {
+        log_warning("Unable to set amp volume?");
+    }
+
     ac_io_emu_response_push(kfca_ac_io_emu, &resp, 0);
 }
 
diff --git a/src/main/sdvxhook2/bi2a.c b/src/main/sdvxhook2/bi2a.c
index cab5916..2aca18d 100644
--- a/src/main/sdvxhook2/bi2a.c
+++ b/src/main/sdvxhook2/bi2a.c
@@ -104,8 +104,12 @@ kfca_amp_control(struct ac_io_emu *emu, const struct ac_io_message *req)
     resp.cmd.nbytes = req->cmd.nbytes;
     memcpy(resp.cmd.raw, req->cmd.raw, req->cmd.nbytes);
 
-    // log_misc("sz %d: %d, %d, %d, %d", req->cmd.nbytes, req->cmd.raw[0],
-    // req->cmd.raw[1], req->cmd.raw[2], req->cmd.raw[3]);
+    // so SDVX5 sets the amps to 0 aka ALL MAX and uses Windows instead
+    // let's leave it to the individual sdvxio to set on init instead
+    // this way if any sdvxio's want to use Windows APIs for SDVX1-4 comapt.
+    // they can do so without doubly affecting the volume
+
+    // sdvx_io_set_amp_volume(0, 0, 0, 0);
 
     ac_io_emu_response_push(emu, &resp, 0);
 }
diff --git a/src/main/sdvxio-kfca/sdvxio-kfca.def b/src/main/sdvxio-kfca/sdvxio-kfca.def
index e4783a2..8d6e632 100644
--- a/src/main/sdvxio-kfca/sdvxio-kfca.def
+++ b/src/main/sdvxio-kfca/sdvxio-kfca.def
@@ -11,3 +11,4 @@ EXPORTS
     sdvx_io_set_loggers
     sdvx_io_set_pwm_light
     sdvx_io_write_output
+    sdvx_io_set_amp_volume
diff --git a/src/main/sdvxio-kfca/sdvxio.c b/src/main/sdvxio-kfca/sdvxio.c
index 8f1d6f3..7c7533e 100644
--- a/src/main/sdvxio-kfca/sdvxio.c
+++ b/src/main/sdvxio-kfca/sdvxio.c
@@ -31,6 +31,7 @@ static uint16_t sdvx_io_analog[2];
 
 static bool running;
 static bool processing_io;
+static int16_t kfca_node_id;
 
 struct ac_io_kfca_poll_out pout_staging;
 struct ac_io_kfca_poll_out pout_ready;
@@ -86,7 +87,7 @@ bool sdvx_io_init(
     uint8_t node_count = aciodrv_device_get_node_count();
     log_info("Enumerated %d nodes", node_count);
 
-    int16_t kfca_node_id = -1;
+    kfca_node_id = -1;
 
     for (uint8_t i = 0; i < node_count; i++) {
         char product[4];
@@ -109,7 +110,11 @@ bool sdvx_io_init(
 
     if (kfca_node_id != -1) {
         log_warning("Using KFCA on node: %d", kfca_node_id);
-        aciodrv_kfca_init(kfca_node_id);
+
+        if (!aciodrv_kfca_init(kfca_node_id)) {
+            log_warning("Unable to start KFCA on node: %d", kfca_node_id);
+            return false;
+        }
 
         running = true;
         log_warning("sdvxio-kfca now running");
@@ -155,7 +160,7 @@ bool sdvx_io_read_input(void)
     }
     processing_io = true;
 
-    if (!aciodrv_kfca_poll(0, &pout_ready, &pin)) {
+    if (!aciodrv_kfca_poll(kfca_node_id, &pout_ready, &pin)) {
         return false;
     }
 
@@ -199,3 +204,19 @@ uint16_t sdvx_io_get_spinner_pos(uint8_t spinner_no)
     }
     return sdvx_io_analog[spinner_no];
 }
+
+bool sdvx_io_set_amp_volume(
+    uint8_t primary,
+    uint8_t headphone,
+    uint8_t subwoofer)
+{
+    if (!running) {
+        return false;
+    }
+
+    if (!aciodrv_kfca_amp(kfca_node_id, primary, 96, headphone, subwoofer)) {
+        return false;
+    }
+
+    return true;
+}
diff --git a/src/main/sdvxio/sdvxio.c b/src/main/sdvxio/sdvxio.c
index 7aae8fe..3bf59a6 100644
--- a/src/main/sdvxio/sdvxio.c
+++ b/src/main/sdvxio/sdvxio.c
@@ -88,3 +88,8 @@ uint16_t sdvx_io_get_spinner_pos(uint8_t spinner_no)
 {
     return mapper_read_analog(spinner_no) * 4;
 }
+
+bool sdvx_io_set_amp_volume(uint8_t primary, uint8_t headphone, uint8_t subwoofer)
+{
+    return true;
+}
diff --git a/src/main/sdvxio/sdvxio.def b/src/main/sdvxio/sdvxio.def
index e4783a2..8d6e632 100644
--- a/src/main/sdvxio/sdvxio.def
+++ b/src/main/sdvxio/sdvxio.def
@@ -11,3 +11,4 @@ EXPORTS
     sdvx_io_set_loggers
     sdvx_io_set_pwm_light
     sdvx_io_write_output
+    sdvx_io_set_amp_volume